What are two measures of small businesses’ contribution to the economy? Explaining employment share and value added

What ‘small business impact on economy’ means: definition and data context

When people ask about small business impact on economy they usually mean two related questions. One asks how many jobs small firms provide. The other asks what share of output or value added those firms produce.

SUSB reports firm-size employment counts that researchers use to measure the first question, while BEA industry accounts supply value-added totals that researchers allocate to size classes for the second question. See the Statistics of U.S. Businesses (SUSB) for firm-size employment counts and regional tables Statistics of U.S. Businesses (SUSB).

In practice, the two measures answer different policy concerns. Employment share helps with workforce planning and local job counts. Value-added share helps when the concern is productivity or contribution to output, not head counts.

OECD guidance and BEA documentation explain how industry totals are mapped to firm-size classes and why the methods matter Industry Economic Accounts: Concepts and Methods.

The two core measures: employment share and value-added (GDP) share

Employment share is the proportion of private-sector jobs that are at firms below a chosen size threshold. Analysts typically compute this from SUSB firm-size bins to show, for example, the share of jobs at firms with fewer than a selected number of employees Statistics of U.S. Businesses (SUSB).

Value-added, or GDP share, is the portion of industry output attributed to firms in those same size classes. BEA provides industry value-added totals, and researchers allocate that output across firm-size classes using microdata and allocation rules Industry Economic Accounts: Concepts and Methods.

The two measures can move differently for the same area. A region may show a large share of jobs in small firms while those firms account for a smaller share of value added. The difference matters because employment counts and value added measure different economic concepts, jobs versus economic output.

OECD work on measuring SME contributions highlights that method choices and industry composition influence both employment and GDP shares, and that careful reporting of methods is essential SME and Entrepreneurship Outlook 2023.

How to calculate an employment-share measure: data and a simple example

Start with SUSB tables that show employment by firm-size bin and total private employment for the geography you care about. You need the employment count for each size bin and the total private-sector employment to compute the share Statistics of U.S. Businesses (SUSB).

The basic formula is simple: employment in small firms divided by total employment, expressed as a percentage. Use the SUSB employment count for your chosen size cutoff as the numerator and the SUSB total private employment as the denominator.

For a worked example, describe the steps rather than invent numbers. Pull the SUSB table for your region, identify the bin or sum of bins that match your size cutoff, and divide that employment total by the SUSB total private employment to compute the share. Document which bins you used and why.

Choosing a size cutoff changes the result. Common thresholds are fewer than 500 employees or fewer than 100 employees, but the choice should reflect the research question. Always state the cutoff when reporting an employment share and link to SUSB documentation for the bin definitions Statistics of U.S. Businesses (SUSB).

How to estimate small firms’ share of GDP or value added: sources and allocation methods

Estimating value-added share begins with BEA industry value-added totals. BEA publishes industry or sector value-added that represents the output side of national accounts and regional accounts Industry Economic Accounts: Concepts and Methods.

Because BEA value-added is reported by industry, researchers must allocate that industry total to firm-size classes. That allocation requires establishment or firm microdata and a transparent rule, for example proportional allocation within an industry using employment weights from SUSB or the Annual Business Survey.

OECD guidance outlines common allocation approaches and cautions that results are method-sensitive. Using different allocation rules can change the estimated GDP share for small firms, so studies should report sensitivity checks and the assumptions behind the allocation SME and Entrepreneurship Outlook 2023.

BEA and national accounts also have timing and geographic mapping issues. Regional value-added estimates may require additional steps to align industry definitions and years between BEA totals and firm-size microdata, and these choices affect comparability Industry Economic Accounts: Concepts and Methods.

Choosing the right metric: decision criteria for policymakers and researchers

Pick employment share when the primary concern is jobs. Employment share captures where workers are employed and helps with workforce planning and local economic development planning. SUSB firm-size tables are the standard source for those counts Statistics of U.S. Businesses (SUSB).

Pick value-added share when the goal is to measure economic output or productivity. The GDP or value-added approach traces contribution to output and is more informative where the question concerns economic production rather than head counts. BEA industry accounts are the starting point for that measure Industry Economic Accounts: Concepts and Methods.

When feasible, report both measures. Present the employment share alongside the value-added share, and include methodological notes, assumptions about allocation, and sensitivity checks so readers can see how robust the conclusions are. OECD materials emphasize reporting methods and confidence statements when publishing size-class estimates SME and Entrepreneurship Outlook 2023.

Common pitfalls and measurement challenges to watch for

Industry composition bias can mislead interpretation. Areas with many small firms in low value-added sectors may show a high employment share but a low value-added share; this difference reflects sector mix as much as firm size SME and Entrepreneurship Outlook 2023.

Firm definitions vary across countries and data sources, which complicates cross-country comparisons. Eurostat materials note that differing size thresholds and classification rules can change the apparent contribution of small firms when comparing regions or countries Small and medium-sized enterprises (SMEs) – statistics on enterprises by size class.

Allocation choices and data lags also create uncertainty. Estimates of small firms’ share of GDP depend on how researchers allocate industry value-added to size classes and on the vintage of microdata. Foundational measurement literature documents these sources of bias and recommends caution when interpreting size-class output shares Firm dynamics and measurement issues affecting size-class contributions to employment and output.

Practical examples and a step-by-step scenario for a regional estimate

Assemble the required inputs. Pull SUSB employment by firm-size bins for the state or metropolitan area and the BEA industry value-added totals for the matching geography or national totals to be allocated. Use the Annual Business Survey or other establishment microdata if you need a finer allocation rule Statistics of U.S. Businesses (SUSB).

Also obtain BEA industry value-added figures for the same year and industry definitions, and review BEA guidance on industry accounts before allocating totals to size classes Industry Economic Accounts: Concepts and Methods.

Workflow, step 1: compute the employment share using SUSB counts for the chosen cutoff. Step 2: select an allocation rule for BEA industry totals, for example proportional allocation using SUSB employment shares within each industry. Step 3: apply the allocation and sum across industries to get a size-class value-added total. Step 4: run sensitivity checks by varying the allocation rule and reporting the range of results.

When presenting results, show both the employment share and the value-added share in side-by-side tables or charts, and include method notes that list data sources, year, size cutoff, and allocation rule. This practice helps readers understand how the measures relate and where uncertainty comes from.

For civic use, campaign websites and candidate profiles can link to primary sources and explain why a local analysis was done. According to the campaign profile approach, candidate pages and public filings are useful for voter information that references primary data sources without making policy promises.

Conclusion and where to look for updated estimates and further reading

For updated figures and methodological guidance, consult the SUSB pages, BEA industry accounts documentation, the SBA Office of Advocacy small business profile, and OECD materials on SME measurement. These are the primary sources researchers cite when reporting size-class contributions Statistics of U.S. Businesses (SUSB).

Open questions remain about recent microdata allocations and consistent international comparators, so treat point estimates as informative but subject to revision as new data and methods become available SME and Entrepreneurship Outlook 2023.

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