Growth Accounting Explained for Business Leaders

The Question Every CEO Should Be Able to Answer

Your company grew 35% last year. Congratulations. But can you explain precisely why?

Not in narrative terms — "we hired great people" or "we launched a new product" — but in quantified, decomposed terms that separate the contributions of additional headcount, capital investment, and genuine improvements in how productively your organisation operates?

Most leaders cannot. And that inability is not a failure of management — it is a failure of measurement. Standard financial reporting tells you what happened but not why. Revenue went up. Costs went up. Margins moved. But the underlying drivers — the productivity dynamics — remain opaque.

Growth accounting is the methodology that makes these dynamics visible.

What Growth Accounting Is

Growth accounting is an economic framework for decomposing output growth into its contributing factors. The methodology was originally developed for national economies by Robert Solow in the 1950s and has been refined extensively by economists including Dale Jorgenson, Carol Corrado, Jonathan Haskel, and Stian Westlake.

At the macroeconomic level, growth accounting separates GDP growth into three components: the contribution of labour (more hours worked), the contribution of physical capital (more machines, buildings, and infrastructure), and total factor productivity, or TFP — the residual that captures improvements in efficiency, technology, and how effectively resources are used.

That residual — TFP — is where things get interesting. In advanced economies, TFP growth has historically accounted for a substantial share of economic expansion. And the research is increasingly clear that TFP growth is driven largely by investment in intangible assets: human capital, data, R&D, organisational processes, and innovative business models.

Applying Growth Accounting at the Firm Level

The same framework that economists apply to nations can be applied to individual companies. At the firm level, growth accounting asks: of the productivity growth this company has experienced over a given period, how much is attributable to changes in labour input, changes in physical capital, and changes in the efficiency with which the company combines its inputs?

The practical value is in the decomposition. Consider two companies, both of which doubled revenue over three years.

Company A achieved this by doubling its headcount. Its revenue per employee remained flat. It grew by adding more people doing the same things in the same way.

Company B achieved the same revenue growth while increasing headcount by only 30%. Its revenue per employee increased significantly. It grew primarily through productivity improvements — better processes, smarter technology use, more skilled employees, and more effective management.

Standard financial reporting treats these two outcomes as equivalent. Growth accounting reveals them as fundamentally different. Company B has built productivity-driving intangible assets that will continue to compound. Company A has not.

The Total Factor Productivity Residual and Intangible Assets

The TFP residual in growth accounting has sometimes been called the "measure of our ignorance" — it captures everything that contributes to growth beyond simple additions of labour and capital. For decades, this residual was largely unexplained.

The breakthrough came when researchers — particularly Carol Corrado, Charles Hulten, and Daniel Sichel — demonstrated that much of TFP growth could be explained by investment in intangible assets. When firms spend on training, R&D, software development, organisational restructuring, brand building, and data infrastructure, they are building assets that improve productivity. But because these investments are typically expensed rather than capitalised, they appear as costs rather than investments on the income statement.

The Productivity Institute's UK Intangibles Growth-Accounting dataset confirms this pattern at the national level. Their data shows that the slowdown in UK labour productivity growth is largely attributable to a slowdown in innovation — specifically, reduced contributions from intangible capital deepening and TFP growth.

The implication for individual companies is powerful: if you can identify, measure, and optimise your intangible asset investments, you can directly influence the productivity dynamics that drive sustainable growth.

How to Implement Firm-Level Growth Accounting

Implementing growth accounting at the firm level requires several components.

Step 1: Establish Output Measurement

Define how you measure the company's output. For most firms, this is revenue, but it can also be gross value added (revenue minus purchased inputs), units of service delivered, or another metric appropriate to the business model.

Step 2: Measure Input Factors

Quantify the key inputs: labour (headcount and quality-adjusted hours), physical capital (equipment, property, technology infrastructure), and intermediate inputs (purchased goods and services).

Step 3: Calculate Productivity

Compute labour productivity (output per hour or per employee) and, where possible, multifactor productivity (output relative to all combined inputs).

Step 4: Decompose Growth

Separate the change in output into the portion attributable to changes in each input factor and the residual (TFP growth).

Step 5: Connect TFP to Intangible Investments

This is where growth accounting meets intangible asset valuation. Map the company's investments in intangible asset categories — human capital, data, R&D, process improvement, brand, and organisational development — and analyse their correlation with TFP improvements over time.

Step 6: Forecast

Use the historical relationship between intangible investments and productivity outcomes to model future growth scenarios. If investing an additional amount in workforce training has historically produced a measurable TFP improvement, what would doubling that investment deliver?

Why This Matters Now

Three developments make firm-level growth accounting more relevant than ever.

First, the shift to intangible-intensive business models means that traditional financial metrics capture a diminishing share of what actually drives company performance. Revenue growth alone tells you very little about a company's underlying health if you cannot see the productivity dynamics beneath it.

Second, investor expectations are evolving. Sophisticated investors — particularly institutional VCs and PE firms — are increasingly looking beyond surface-level metrics. They want to understand whether a company's growth is driven by genuine productivity improvement or simply by spending more money.

Third, the technology now exists to do this at scale. What used to require a team of economists and months of analysis can now be done continuously through platforms that ingest operational and financial data and produce growth accounting decompositions in real time.

For the last 20 years, my research has focused on making firm-level productivity measurement practical and accessible. The Opagio Growth Platform represents the productisation of that work — a system that brings growth accounting out of academic papers and into the hands of company leaders and their investors.

What Growth Accounting Reveals That Nothing Else Can

Growth accounting answers questions that no other analytical framework can address. It reveals whether your company is growing through productivity or through input accumulation. It identifies which intangible asset categories are generating the highest returns. It provides early warning when productivity growth is slowing, even if revenue growth is still strong. It connects investment decisions to measurable outcomes. And it provides the analytical foundation for credible growth forecasts.

For investors evaluating a portfolio company, for CFOs allocating capital, and for boards assessing management effectiveness, these are among the most important questions in business. Growth accounting is how you answer them.

Use the Productivity Calculator to model how intangible investments affect your company's growth trajectory.

This is the third in a series of articles on intangible asset valuation and growth accounting. Read the complete guide: The Complete Guide to Intangible Asset Valuation