Showing posts with label construction economics. Show all posts
Showing posts with label construction economics. Show all posts

Tuesday 19 December 2023

How to Research the Construction Industry?

Recent additions to the Construction Economics library

 

 



The construction industry is not like the typical industry found in economic textbooks, due to the physical nature of the product, the variability of demand, the method of price determination by auction, the contractual relationships between clients, contractors and suppliers. These characteristics require adjusting economic principles to adequately reflect the industry. Further, those four characteristics of construction vary between countries, as do the regulatory systems in different places. 

 

So, given this diversity of industry participants, products and process, how should research into the structure and performance of the construction industry and the management of firms and projects be done? Obviously, a variety of perspectives and a multi-disciplinary approach are required, and this is where Construction Economics (CE) contributes.

 

CE is the application of economic principles to the construction industry. However, because of the distinctive characteristics of the organisation of construction processes, the structure of construction markets, and the management of construction firms, this is not a straightforward process. Therefore, CE research uses a broad range of approaches to research the construction industry, its firms and projects. These include industrial organization and other management studies, financial and behavioural economics, econometric analysis and modelling, cost modelling, legal and institutional research, and transaction cost economics.

 

The library of CE research has been growing recently. The nine books below share an economic perspective that focuses on firms and industries rather than individual projects, which differentiates them from other books on specific topics like procurement, estimating, cost management, and life cycle costs, although all these topics are included in the CE books. This combining of economic theory and techniques with industry specific knowledge is a distinctive characteristic of CE research, and although most of the authors are academics, many of them have industry experience. 

 

In these recent publications the range of topics covered include the roles of participants and processes, productivity and value for money, environmental performance and sustainability, the delivery process and procurement, the financing, viability and competitiveness of construction firms and projects, technological and institutional development, construction statistics and measurement, international construction, regulation, decarbonisation, and government policies affecting the industry. Across the books there are differences in emphasis, sometimes marked. 

 

These books should become standard references for researchers and people working on policy issues related to construction and the built environment. They cover an extremely wide range of topics, many of which overlap related areas like business and project management, industry development and policy, innovation, sustainability and data quality. Some of the topics and issues discussed are extremely difficult to nail down, and there are a few general themes that weave through all the books.  

 

As these books show, when researching construction a variety of perspectives are required, some of which come from outside the neoclassical model of firms and markets, such as institutional or development economics. Therefore, CE has developed a distinctive research agenda on the production, delivery and management of the built environment in a wide range of conditions and countries. The five edited volumes have a total of 70 chapters, 10 of which are introductions and conclusions. The remaining 60 chapters demonstrate the current state of CE research and represent the range and diversity of that research. 

 

There are eight books from academic publishers. The five edited volumes, and three textbooks. Included at the end are links to the publishers’ websites where the table of contents, authors and descriptions for their books can be found. As academic publications they are not cheap, which unfortunately limits the potential readership, and the books will therefore be read mainly by academics and researchers through their institution’s library. Perhaps future collections could republish some of this work as in cheaper ebook and paperback options. 

 

Declaration of interest: I contributed one or more chapters to the edited volumes, two as co-author with Jim Meikle, and the Foreword to Christian Brockmann’s Construction Microeconomics. There is a ninth book, my one on technology and construction, at the end. 




 

 


Ofori, G. (ed.) 2022. Research Companion to Construction Economics, Edward Elgar

 

The book has 24 chapters in a collection that ‘represents a relatively complete work on the field of construction economics.’ And that’s right, there is a bit of everything: costs, markets, history, data, procurement, ESG, developing countries and so on. The table of contents are well worth a look, with the multi-disciplinary nature of CE on full display. The book gathers several decades of research in an overview of CE in 2022. 

 

It is thus a heavyweight academic publication, the chapters are comprehensive, dense and detailed and, as you would expect in a handbook, meticulously referenced. Intended as a library resource, it will be the starting point for researchers on many topics in CE and related fields for many years to come. 

 

Edited by George Ofori, the book makes the case for CE as an alternative to other approaches to researching construction that focus on issues such as culture or project management. His Introduction on the development of CE and review of the chapter topics can be downloaded from the e-elgar site by going to the link for a sample chapter under the Add to basket button. He started with this definition:

 

‘Construction Economics applies economic theory, concepts and analytical tools to the construction industry, the companies and organisations comprising it, and the projects it undertakes. Over time, the field has been extended beyond the minimisation of capital cost on projects to include life-cycle cost considerations, the idea of value, sustainable construction and climate change, and applications of technology. Attention has also been extended to include consideration of companies and organisations; and the strategic, industry-level considerations involving the economy and construction markets, changing government policy, and international finance and economics.’ 

 

Not only is this an excellent definition of CE, it also makes clear the range of topics and issues CE can make a contribution to. The book is a significant milestone in the development of CE.

 

 


Gruneberg, S. (ed.) 2019. Global Construction Data, Taylor & Francis

 

In his Preface Stephen Gruneberg, the editor of Global Construction Data, says the ‘book covers several theoretical and practical aspects of global construction statistics and their use. It demonstrates the diversity of approaches and points in the direction of a need to co-ordinate the measurement of national construction industries’. The diversity of approaches is the great strength of the book, which demonstrate both the range of CE and its application.

 

The ten contributions include three with detailed discussion of construction statistics, two on international comparisons, two use residential cost data for life-cycle costing and energy use respectively. The other three cover innovation and BIM, the global market for architectural services, and international contractor’s make-buy decisions. Taken together these chapters cover construction data at the international, national and project levels. 

 

The way we see and understand an industry starts with the data provided by national statistics agencies. How data on Construction is collected and how the categories within Construction are defined is clearly important. The former determines the quality and the latter the credibility of the statistics produced. In the title the book made explicit the importance of this as a specific topic in CE research. The reliability and quality of construction statistics is a well-known issue, going back to the 1960s, and the shortcomings of the SNA and SIC have not been overcome in the revisions since then. 

 

 


Best, R. and Meikle, J. (eds.) 2023. Describing Construction: Industries, projects and firms, Taylor & Francis

 

The last in a series of three CE books edited by Rick Best and Jim Meikle, Describing Construction addresses the question ‘What exactly is the ‘construction industry’? Research on defining and measuring construction at many different scales is a distinctive characteristic of CE, as this is not done elsewhere. The scales range from firms to projects to the broad construction industry, which includes all participants in the supply chain. The book has contributions at the three scales of industry, project and firm.

 

The chapters on industry definitions and boundaries, which includes one on construction in developing countries, argue for a new perspective on construction and for better data. At the project level, there are chapters on estimating, procurement and contracting. The chapters on firms cover characteristics and financial failure, strategic planning, innovation and industry transformation. The book combines several chapters that are analytical and empirical (using or about data) with some more general chapters that provide an overview of their topics. 

 

All the contributors to the 36 chapters in this series of books have extensive industry experience, which is apparent in the depth of discussion and awareness of the issues involved. The books will be used by researchers investigating construction and related industries for many years to come.  

 

 


Best, R. and Meikle, J. (eds.) 2919.  Accounting for Construction: Frameworks, productivity, cost and performance, Taylor & Francis

 

The second book from Rick Best and Jim Meikle was Accounting for Construction: Frameworks, productivity, cost and performance. The dozen contributions again look at different ways of measuring and comparing construction. With chapters on construction statistics, productivity, costs and data, the book both reviewed and extended previous studies. An ‘important thread’ was the lack of consistency in the way construction industry data is collected and how it is aggregated. 

 

Several chapters look at national construction statistics and their many peculiar characteristics in detail, explaining how data is collected and processed in national statistics. Issues affecting productivity performance and measurement are also discussed in several chapters, such as the building cycle, capital stock, innovation and the relationship between input costs and the technology used. 

 

The book is dense with information, with key topics that reappear across the chapters in different contexts with different perspectives. It is a starting point for construction economists and others who want to understand how industry data is compiled and can used, more about the nuts and bolts of construction data compared to the previous book on Measuring Construction, which was more of a toolkit. 



Best, R. and Meikle, J. (eds.) 2015.  Measuring Construction: Prices, Output and Productivity, Taylor & Francis

 

In Measuring Construction: Prices, output and productivity Rick Best and Jim Meikle put the focus on data sources and quality. As the introduction makes clear ‘there are standard methods for measurement of physical building work, but the same cannot be said for the characteristics of the construction industry’. The three broad topics addressed are costs and prices, activity and internationalisation, and construction productivity. Their conclusion was ‘there is no ‘correct’ answer to any of the questions this book explores … It is perhaps only by applying a variety of techniques to the various problems and comparing the results that we obtain that we will know if we are getting closer to developing an acceptable set of tools and methods.’

 

The chapters survey issues in the collection and use of construction data. The twelve contributions cover measurement of construction work, productivity measurement methods, and construction costs and prices at the global, national, industry and project levels. On each of these topics the research is detailed and focused, there are useful analytical and methodological insights, and a few chapters have models that could be applied and developed. 

 

There is a great deal of data in the book, as you’d expect from the title, and good empirical work showing how comparisons can be made and data used. One of the chapters on productivity argued for the use of artificial neural networks (i.e. AI) for construction estimating and management, a particularly forward-looking contribution in 2015.

 


 Brockmann, C. 2023. Construction Microeconomics, Wiley Blackwell

This is the first book to focus on microeconomic aspects of construction, and that focus allows an extended discussion of topics than found in previous CE books. Microeconomics studies the interaction of producers and consumers of goods and services in specific industries and markets, and the tools and techniques used are well-known. In a simple exchange market, where the transaction is complete, the analysis of demand and supply is relatively straightforward, but construction markets are not like that. Christian Brockmann introduces the idea of contract goods that are delivered over time and priced by bids from contractors, and the analysis of how those characteristic features of construction affect the behaviour of owners and contractors in Construction Microeconomics is both original and insightful.

 

Chapters 2 to 9 cover micro basics: principles, consumers, producers, perfect markets, imperfect markets, factor markets, information, and game theory/auctions. Part II contains the adaptation of microeconomics to construction, with chapters on the construction sector, owners, contractors, construction goods, construction markets, contracting, imperfections, government policy, and public goods.

 

This book discusses the behaviour of firms and the nature of construction products and processes in detail. In particular, bidding for work in auctions and contracting under uncertainty for owners and clients who are risk adverse raises complex issues around marginal costs and prices, incentives and behaviour, and information asymmetry and bargaining power. The analysis draws on developments in industry economics to support the points made and the approach taken. 

 

This micro focus of the book provides a deeper understanding of the complex relationships between construction industry participants, and has been deeply informed by the author’s industry experience. It demonstrates how economic principles can be applied to a market that uses auctions and tenders to set prices, essential knowledge for regulators and management in industry. 

 

Christian Brockmann has built on previous work and brings a new perspective to issues and topics that are fundamental to CE. The book will be of interest not just to academic researchers but also to industry, regulators and policy makers. His Construction Microeconomics focuses on the operation and organisation of construction from a micro perspective, and is an important addition to the CE library. A companion volume is in the works: Construction Macroeconomics, by Horst Brezinski, Christian Brockmann, Kira Coleman and Huojin Xiong.

 

 


Gruneberg, S. and Francis, N. 2019. Economics of Construction, Agenda Publishing

Stephen Gruneberg and Noble Francis’ The Economics of Construction provides ‘a game theory account of the behaviour of firms’, the approach typically taken in other branches of industry economics. The Gruneberg and Francis book does not have much discussion on macroeconomic matters, however they discuss innovation and productivity, aspects of firms’ business models and financing, and contractual disputes and power relations in construction. 

 

There are case studies of the collapse of UK contractor Carillion in 2018, the Grenfell Tower fire, construction for the London Olympics, and manufactured housing in the UK. These are used to illustrate how the business environment a construction firm faces has become significantly more complex over the decades as the traditional turnover and profit maximizing contractor or supplier has evolved into one primarily concerned with growth and survival. While that may be a matter of degree, it is not insignificant. 

 

Gruneberg and Francis argue contracting markets compete profits down to the point firms cannot invest in productivity improvements, the outcomes of a business model that tends to focus on the volatility of demand and managing risk at the expense of improving efficiency. Construction firms operate in an industry Gruneberg and Francis describe as ‘a highly fragmented project-based industry, with very low profit margins and a high risk of failure for the many firms operating in a very complex supply chain’. This is a widely held view, however many large construction firms are over 50 years old and there are significant barriers to entry for major projects. It is an industry with a majority of small firms and relatively few large multinational contractors and manufacturers, some of which have substantial bargaining power in the supply chain. 

 

In the last two chapters they point to an emerging field of research on the economics of construction projects, combining project financial and feasibility studies with procurement strategies, using research applying transaction cost economics to construction. The book is an outstanding example of CE research as the application of economic principles to construction. It combines industry specific knowledge with insights from economic reasoning and shows how those insights improve our understanding of the industry.

 


 Myers, D. 2022. Construction Economics: A new approach (5th ed.) Routledge

 

Danny Myers Construction Economics: A new approach is intended for undergraduate students in construction and other built environment courses who have a single economics subject included in the course. The new approach is sustainability. Although UK-centric, this is a readable and accessible introductory textbook that has a bit of everything.

 

It starts with the fundamentals of economic theory on firms and markets, and then analyses competition, demand, tendering, costs and prices. The main micro, macro and industry economics topics are covered, and the relevance to construction is maintained through breakout boxes with short examples and case studies from construction throughout the book, which are a feature. 

 

Myers emphasises environmental issues and sustainability, and this is another one of the reasons for its success as these topics have become embedded in university curricula. The book is now in its fifth edition, which is I think another milestone in CE, and Danny Myers is to be congratulated on the achievement. 

  




de Valence G. 2022. Creative Destruction and Constructing the Built Environment: From the first industrial revolution to the fourth, CER

 

This is my book about technological change, general purpose technologies (like steam power, IT and AI), and construction since 1800. Because I can set the price it is cheap, not expensive, and available from Amazon. The Introduction can be read here.

 

Creative destruction is the effect of technological progress on the economy as, over time, new technologies bring new industries and products to challenge established industries. Innovation and technology have restructured construction of the built environment in the past, and today powerful new technologies like digital twins, AI and 3D printing are leaving their development stage and finding their way into the design and delivery of buildings and structures. The book argues it might take a decade or more for these technologies to become central to construction of the built environment, but the development path taken will be distinct and different from the path taken in other industries. This path dependence varies from both industry to industry and between firms within industries. 

 

 

 

Publishers’ Pages 

 

Best, R. and Meikle, J. (eds.) 2023. Describing Construction: Industries, projects and firms, Taylor and Francis.

 https://www.routledge.com/Describing-Construction-Industries-Projects-and-Firms/Best-Meikle/p/book/9780367608903

 

Best, R. and Meikle, J. (eds.) 2919.  Accounting for Construction: Frameworks, productivity, cost and performance, Taylor & Francis.

https://www.routledge.com/Accounting-for-Construction-Frameworks-Productivity-Cost-and-Performance/Best-Meikle/p/book/9781032093246#

 

Best, R. and Meikle, J. (eds.) 2015.  Measuring Construction: Prices, Output and Productivity, Taylor & Francis.

 https://www.routledge.com/Measuring-Construction-Prices-Output-and-Productivity/Best-Meikle/p/book/9780367738341

 

Brockmann, C. 2023. Construction Microeconomics, Wiley Blackwell.

https://www.wiley.com/en-ie/Construction+Microeconomics-p-9781119831938

 

de Valence G. 2022. Creative Destruction and Constructing the Built Environment: From the first industrial revolution to the fourth, CER.

https://www.constructioneconomicsresearch.com/creative-destruction-book

 

Gruneberg, S. (ed.) 2019. Global Construction Data, Taylor & Francis. 

https://www.routledge.com/Global-Construction-Data/Gruneberg/p/book/9781032177472

 

Gruneberg, S. and Francis, N. 2019. Economics of Construction, Agenda Publishing. 

https://www.agendapub.com/page/detail/the-economics-of-construction-by-stephen-gruneberg/?k=9781788210157

 

Myers, D. 2022. Construction Economics: A new approach (5th ed.) Routledge. 

https://www.routledge.com/Construction-Economics-A-New-Approach/Myers/p/book/9781032262611

 

Ofori, G. (ed.) 2022. Research Companion to Construction Economics, Edward Elgar.

https://www.e-elgar.com/shop/gbp/research-companion-to-construction-economics-9781839108228.html

 

Wednesday 14 June 2023

Getting a Broad View of Constructing the Built Environment

A Satellite Account for Built Environment Industries

 

 

How the built environment is created and maintained through project initiation, design, fabrication and construction to operation, repair and maintenance is an ongoing process. The network of firms involved includes construction contractors and subcontractors, property management and real estate services, manufacturers of fittings, finishings, plant and equipment, suppliers of building materials, and professional services. All these firms belong to industries that are part of the process of producing and maintaining the built environment. 

 

National agencies collect data and present it in tables following the format given in the System of National Accounts (SNA) published by the UN. The national accounts present highly aggregated estimates of expenditure, output and income based on the detailed data collected on the economic activities of households, firms, non-profits and government. That data is collected using the methods, definitions and categories provided in the SNA, ISIC and other publications. Firms and other organizations are assigned ISIC codes on the basis of common characteristics in products, services, production processes and logistics, and collects companies and other organizations into groups with similar characteristics.

 

Industries as defined by SIC classifications cannot capture all their associated economic activities, and when economic activities involve a range of different industries the contribution of a sector is not obvious, despite its importance. Because the ISIC system puts strict boundaries around an industry, what is included or left out of the definition of an industry determines its extent. However, inclusions and exclusions vary greatly between industries and there are many anomalies. Examples are:

·      Health insurance is included in Insurance not in health expenditure

·      Retail sales by chemists is included in Pharmaceutical expenditure as well as manufacturing and R&D

·      Research is classified to industries not by purpose, and often done by institutions

·      Automobile manufacture includes design, Construction does not 

 

The solution to the issues raised by narrow SIC industry definitions is a satellite account that reclassifies expenditures from different industry groupings into a single sector. Satellite accounts have been produced for many sectors that are made up of several industries, such as health, the digital economy, the environment, R&D, the space industry, and infrastructure. They have also been produced for non-profit institutions, volunteering, education and training, and unpaid household activities. They are used to provide more detail on sectors that are not visible in current statistics, following guidelines provided by the SNA for their preparation. The most widely found satellite account is for tourism, so far produced at various times for over 50 countries. This brings together the contributions of industries like travel, accommodation, hospitality, tour operators and entertainment to estimate their total output and employment.

 

The primary purpose of satellite accounts is to improve policy-making by providing better, more granular data, and demand for satellite accounts has increased as their usefulness has been shown. A 2019 survey by the UN found 80 countries had produced 241 satellite accounts covering over 20 different topics, with 148 of those done since 2000, mainly on health, tourism and the environment. The number produced by country varied from one to 15, the median number of satellite accounts in production was 2 and the average was 4. As a result, there are many guidelines for producing a satellite account available, usually produced through international collaboration, and the methodology has been adapted to a wide variety of sectors. 

 

 

Figure 1. Number of satellite accounts by sector



Source: Conference of European Statisticians, 2019: 11. In-depth review of satellite accounting, Paris: UNECE.

 

 

Preparation of a satellite account requires significant research and development. Different data sources have to be harmonized and measurement challenges met. The OECD published System of Health Accounts in 2000 (updated 2011) after 15 years of development of the concepts and methods needed for a health satellite account, and the US Bureau of Economic Analysis (BEA) worked on their R&D satellite account for over a decade. However, the research is being done and more satellite accounts are being produced, such as the 2020 estimates for The Small Business Economy, and the Space Economy. In 2021 the OECD published the first Working Paper on a Transport satellite account.

 

A built environment sector satellite account would restrict its scope to relevant activities, and would therefore remain within the production, consumption and asset boundaries of the SNA framework, a type of satellite account known as a thematic account. Some examples of thematic accounts are agriculture, tourism, culture, and sport and recreation. Developing a sector based thematic account involves regrouping, re-arranging and re-packaging existing national accounts data by creating definitions of the economic activities, products, suppliers and users involved.[i] In some cases the national accounts data is supplemented by other sources, such as surveys of household activities or expenditure, that collect data on the use of products and supply of services not otherwise available. 

 

Despite issues of data quality and availability, bringing together the range of industries that contribute to the production, maintenance and management of cities, infrastructure and buildings in a satellite account would improve our understanding of both the sector and the wider economy. For example, urban development and city policies involve significant infrastructure spending, which is often their main focus. However, it is the associated induced industrial, commercial and residential development around the new infrastructure that drives longer-term growth. A satellite account captures that activity. 



[i] In selecting a number of industries of special interest ‘It is common practice to refer to such groupings of industries as “sectors” even though they do not constitute institutional sectors as the term is used in the SNA. The SNA does not try to provide specific and precise criteria for the definition of what identifies a key sector or activity….. in some important cases, such as tourism and environmental protection activities, the process of identification of characteristic and connected products is complex because not all the relevant activities and products appear in the central framework classifications.’ OECD, 2000. A System of Health Accounts, OECD Publishing, Paris. 

     Characteristic products are those that are typical of the field, for construction characteristic products are buildings and structures, project management and other professional services. Connected goods and services includes expenditure on products that are not typical and are classified to other product categories.  In construction quarrying, manufactured products and transportation of materials and components may be considered connected.

Thursday 1 December 2022

Construction Productivity Trends for Building, Engineering and Construction Services

 Australian Construction Productivity at the Industry Level

 

 

The rate of growth of productivity in the construction industry in a number of countries has lagged that of other industries for at least five decades, and the earliest studies that identified this problem date from the late 1960s. Two explanations for the lack of demonstrable improvement in construction productivity are possible. The first is the importance of measurement, data and issues about the structure and use of price indices for estimating real output (i.e. adjusted for inflation). 

 

The second is the nature of the product and the methods used in delivering and managing the processes involved.  Construction is a labour intensive industry in comparison with manufacturing, but there has been a significant increase in the prefabricated component of construction, which could have been expected to lead to productivity growth. Also, construction methods have become more capital intensive as machinery has got heavier, and the number of cranes, powered hand tools and other equipment used has increased.  However the productivity growth that one would expect to observe as a result of these trends has not occurred, according to measurements by national statistical agencies.

 

Productivity estimates require both a measure of labour inputs, such as hours worked or people employed, and a measure of output, called Industry value added (IVA, the difference between total revenue and total costs). IVA is then adjusted for changes in prices of materials and labour to estimate Gross value added (GVA) using price indexes that assume there has been no change in the quality of buildings. Another problem is the application of a single deflator to the diverse range of buildings and structures. This inability to capture functional differences and quality changes in buildings and structures has adversely affected the measurement of productivity, if construction value added is underestimated due to the deflators used, construction productivity has also been understated.

 

This post compares the deflated GVA per person employed to the IVA per person employed for Building, Engineering and Construction services (the trades), and Total construction. The GVA data comes from the ABS National Accounts (chain volume measures of economic activity). The IVA data and number of people employed in June each year comes from ABS Australian Industry

 

 

A Proxy for Construction Productivity

 

In Figure 1 industry output is in constant dollars (the deflated value adjusted for price changes). GVA is the quantity of output produced in a year. The employment data includes all workers but not whether they are full or part-time, or hours worked. 

 

Figure 1. Construction Productivity by Industry

Source: ABS, CER

 

As a measure of productivity GVA per person employed is very approximate, typically the number of hours worked would be used for employment and June may not be a representative month for employment in many industries. Nevertheless, this graph looks familiar, with flatlining growth in Total construction productivity over the period, despite a few bumps along the way. It appears to be a useful productivity proxy. 

 

Using the same data, GVA per person employed can be found for Building, Engineering and Construction services. Here a slight decline in Building has been offset by a small rise in Construction services output per person, with the effects of the pandemic on both apparent in the decline over 2020-21. Building construction may have been affected by a shift from commercial to an increased share of residential in the output mix and more high rise work. Because Construction services are generally labour intensive they will have a lower value of output per person, but this data shows there was increase in this measure of productivity between 2007 and 2021 and Construction services was the only one of the three industries to register a gain on this measure. 

 

Engineering construction activity took off in the mining boom from 2010, and output per person has followed the rise and fall in work done since and, although below the peak years of 2012-14, it now reflects the large volume of infrastructure work in transport and energy. Since 2011 GVA per person in Engineering has been much higher than Building construction, nearly twice as much in some years, and Construction services, nearly three times as much in some years. 

 

These differences in output per person employed reflect differences in capital requirements and expenditure on purchases of buildings, structures, software, equipment and machinery (known as gross fixed capital formation or GFCF). The higher the capital requirements, or capital intensity, of an industry the higher the level of output per person employed is expected to be, because workers with more capital are more productive. Both excavators and shovels require one operator but the former shifts more soil.

 

 

Current Dollar Industry Comparison 

 

The chain volume measure of GVA per person employed can be compared to the original, unadjusted current dollar Industry value added (IVA) per person employed. Again, this is an indicative but imprecise proxy for construction productivity. In Figure 2 there is a clear upward trend in all three industries, with increasing nominal value of output as prices rise faster than the number of people employed. 

 

The growth in IVA per employee for Building is the greatest contrast to the GVA data. Here, Building has had a sustained increase since 2012 compared to the flat, no growth trend in GVA per employee. This suggests there has been a better productivity performance by building contractors than the one recorded in official statistics. 

 

Engineering has a similar pattern in both GVA and IVA graphs, with a sharp rise in output per employee after 2010 that flattened out after 2016 at around 50 per cent higher than the pre-mining boom level. This has been a significant increase in productivity. Both Building and Engineering typically have larger firms than found in Construction services, which has lagged the other two industries in growth in IVA per employee. 

 

Without deflation the value of output could be expected to rise somewhere around the rate of CPI inflation, which totalled 35.8 per cent and averaged 2.2 per cent a year between 2007 and 2021. Over that period Building IVA increased by 120 per cent, Engineering IVA by 117 per cent, and Construction services by 50 per cent. More significantly, IVA per person employed for Building increased by 61.6 per cent, for Engineering by 57.3 per cent, but for Construction services only 27.7 percent, suggesting that is where the productivity ‘problem’ lies. However, the IVA and GVA figures are contradictory, with the latter showing better performance. 

 

 

Figure 2. Nominal output per employee




Source: ABS, CER

 

IVA per employee again highlights differences in the capital requirements of industries. In the long run, investment in GFCF determines industry growth rates and their level of labour productivity. Labour intensive industries like Construction services have a low level of IVA per person employed, but also have lower capital requirements. Engineering has always been more capital intensive than Building, but the gap seems to have closed with the increase in residential high-rise activity after 2016. 

 


Conclusion

 

Construction productivity estimates are usually given for Total construction, and typically show little or no growth over many decades. However, Total construction is measure of the combined performance of three different industries: Building, Engineering and Construction services. This post compared the deflated GVA per person employed to the nominal IVA per person employed for Building, Engineering and Construction services (the trades), and Total construction.

 

The deflated GVA per person employed data is a proxy for productivity because the value of output is adjusted for price changes, As a combination of deflated output and employment GVA per person employed looks like a measure of productivity, but while it is indicative that is not really the case. Although similar to the output and input data needed to calculate productivity, indexes of output and input are used for productivity analysis, not the original data, and hours worked not numbers employed used. 

 

When the mostly flat chain volume measures of GVA per person employed are compared to the current dollar IVA per person employed there is a clear upward trend in IVA all three industries, with increasing nominal value of output as prices rise faster than the number of people employed. IVA per person in Building and Engineering has increased at nearly twice the rate of CPI inflation, but Construction services by less since 2007. 

 

Construction services IVA per person employed grew significantly less than Building and Engineering. However, the GVA per person employed performance was much better, the only one of the three industries to register a gain on this measure. Construction services have a large impact on productivity because they account for 60 per cent or more of Construction output. 

 

The usefulness of both GVA and IVA per person employed as a proxy for productivity per person is limited, but indicative. In both cases the difference in capital intensity appears to be the determining factor in the level of productivity (measured as dollars per person employed), and the increase in apartment building would explain the rapid rise in Building IVA per person employed. The effect of changes in output (the mix of buildings and structures delivered) will be explored in another post. Why that increase in Building IVA per person employed was not picked up in the GVA per person employed estimates is also an interesting question.