The Business Dynamics Statistics (BDS) includes measures of establishment openings and closings, firm startups, job creation and destruction by firm size, age, and industrial sector, and several other statistics on business dynamics. The U.S. economy is comprised of over 6 million establishments with paid employees. The population of these businesses is constantly churning –– some businesses grow, others decline and yet others close. New businesses are constantly replenishing this pool. The BDS series provide annual statistics on gross job gains and losses for the entire economy and by industrial sector and state. These data track changes in employment at the establishment level, and thus provide a picture of the dynamics underlying aggregate net employment growth.
There is a longstanding interest in the contribution of small businesses to job and productivity growth in the U.S. Some recent research suggests that it is business age rather than size that is the critical factor (see, e.g., Davis and Haltiwanger  and Haltiwanger, Jarmin, and Miranda ). The BDS permits exploring the respective contributions of both firm age and size.
One key advantage of the BDS is that business dynamics at both the firm and establishment level can be tracked, measured and analyzed. Another advantage is that the BDS is based on data going back through 1976. This allows business dynamics to be tracked, measured and analyzed for young firms in their first critical years as well as for more mature firms including those that are in the process of reinventing themselves in an ever changing economic environment. Examples of this can be found in Moscarini and Postel–Vinay (2009) and Moscarini and Postel–Vinay (2011).
The BDS data can help economists, policy–makers, and the business community develop a more complete understanding of the dynamics of employment over the business cycle and the contribution of businesses of different age and size.
The Business Dynamics Statistics (BDS) is a product of the U.S. Census Bureau. The BDS were developed by the Center for Economic Studies (CES). The BDS data are compiled from the Longitudinal Business Database (LBD). The LBD is a longitudinal database of business establishments and firms covering the years between 1976 and 2010. As additional years of the LBD become available, the BDS will be updated.
The LBD is constructed by linking annual snapshot files from the Census Bureau's Business Register (BR)  to provide a longitudinal history for each establishment. The linkage process makes use of numeric establishment identifiers as well as probabilistic name and address matching. The linkage process allows the tracking of net employment changes at the establishment level, which in turn allows the estimation of jobs gained at opening and expanding establishments and jobs lost at closing and contracting establishments.
The LBD was originally conceived and constructed to be a research dataset only available to qualified researchers through the network of secure Census Bureau Research Data Centers. It has been used in numerous studies that have been published in leading scholarly journals. It has also seen increased use as source of special tabulations. The growing demand for tabulations from the LBD is why the Census Bureau has developed the publicly–available BDS.
The coverage and scope of the BDS are based on the Census Bureau's County Business Patterns (CBP) program. The CBP program has been producing annual statistics on different measures of economic activity since 1964. The CBP serves a wide constituency of users including researchers, policy makers and the business community alike. It is used by the research community to study the economic activity of small areas and to analyze economic change over time; by program areas as a benchmark for statistical series, surveys, and databases between economic censuses. Businesses use the data for analyzing market potential, measuring the effectiveness of sales and advertising programs, setting sales quotas, and developing budgets. Government agencies use the data for administration and planning.
Table 1 presents a detailed listing of the CBP in–scope rules. County Business Patterns covers most of the country's economic activity. The only major exclusions are self–employed individuals, employees of private households, railroad employees, agricultural production employees, and most government employees. This represents the practical totality of the private non–agricultural sector of the economy. Table 2 presents definitions of key data items in the BDS.
|Agricultural Services, Forestry, and Fishing
Transportation and Public Utilities
Finance, Insurance, and Real Estate
|Excluded Employee Types||Self–employed
Domestic service workers
Agricultural production workers
Most government employees
Employees on ocean–borne vessels
Employees in foreign countries
|Establishments||The CBP series excludes governmental establishments except for liquor stores (SIC 592), wholesale liquor establishments (SIC 518), depository institutions (SIC 60), federal and federally sponsored credit agencies (SIC 611), and hospitals (SIC 806).|
|Employment||Full– and part–time March 12 employees. Includes employees on paid sick leave, holidays, and vacations. Does not include proprietors and partners of unincorporated businesses.|
|Payroll||Total payroll includes all forms of compensation, such as salaries, wages, reported tips, commissions, bonuses, vacation allowances, sick–leave pay, employee contributions to qualified pension plans, and the value of taxable fringe benefits.|
Establishments are used in the tabulation of the BDS statistics. An establishment is a fixed physical location where economic activity occurs. A firm may have one establishment (a single–unit establishment) or many establishments (a multi–unit firm). Firms are defined at the enterprise level such that all establishments under the operational control of the enterprise are considered part of the firm. Firm level data are compiled based on an aggregation of establishments under common ownership by a corporate parent using Census Bureau company identification numbers. The firm–level aggregation, which is consistent with the role of corporations as the economic decision makers, is used for the measurement of the LBD data elements by size class and age class.
The BDS data measure the net change in employment at the establishment level. These changes come about in one of four ways. A net increase in employment can come from either opening establishments or expanding establishments. A net decrease in employment can come from either closing establishments or contracting establishments.
Gross job gains include the sum of all jobs added at either opening or expanding establishments. Gross job losses include the sum of all jobs lost in either closing or contracting establishments. The net change in employment is the difference between gross job gains and gross job losses.
The formal definitions of employment changes are as follows:
Some simple identities are useful to note to interpret and use these statistics. Let Eit be employment in year t for establishment i. Define establishment–level employment growth as follows:
git = (Eit – Eit–1) / Xit
Xit = 0.5 * (Eit + Eit–1)
This growth rate measure has become standard in analysis of establishment and firm dynamics because it shares some useful properties of log differences but also accommodates entry and exit (see Davis, Haltiwanger and Schuh , and Tornquist, Vartia, and Vartia ). The above definitions of JC and JD for establishments classified in group s (e.g., a firm size, firm age category) are given by:
The net change in employment for establishments in group s satisfies the following identity:
For growth rates, the analagous relationships are given by:
The latter variable Xst denotes the sum of average employment over a consecutive two–year period and as is clear from the above it is simple to convert the changes to rates by dividing the relevant measures by this variable. Note that in general the variable Xst for a particular classification is not equal to the simple average of the employment variable using the current and prior year since establishments are assigned the characteristics of the firm that owns the establishment in t and this may have changed from year t–1 to year t.
The employment measure used for the tabulations is the number of employees at the establishment for the payroll period including March 12. As such, all growth rates are based on March–to–March changes and the tabulations for a given year are the changes from the prior year to the current year. An establishment opening or entrant is an establishment with positive employment in the current year and zero employment in the prior year. An establishment closing or exit is an establishment with zero employment in the current year and positive employment in the prior year. The vast majority of establishment openings are true greenfield entrants. Similarly, the vast majority of establishment closings are true establishment exits (i.e., operations ceased at this physical location). However, there are a small number of establishments that temporarily shutdown (i.e., have a year with zero employment) and these are excluded from the counts of establishment openings and closings.
In the released series, the job flow measures are provided in terms of both level changes (e.g., the number of jobs) as well as rates using the above denominator as described above to convert level changes to rates. In addition, the number of establishments in each of the categories of change (openings, closings, continuers) and the classifications (e.g., firm size, firm age, etc.) is provided which permits tracking the gross and net flows of the number of establishments. The decomposition into openings, closings and continuers permits decomposing gross job creation into the component from continuing establishments that are expanding and establishment openings and decomposing gross job destruction into the component from continuing establishments that are contracting and establishment closings.
It is critical to emphasize that the BDS contains measures of net and gross flows of establishments and jobs at the establishment level. All establishments are, however, linked to their parent firm so that the net and gross flows of establishments and jobs can be categorized by the characteristics of the parent firm. In particular, establishments are classified by both the size of the parent firm and age of the parent firm as defined below. This enables quantifying the contribution of firms by firm size and firm age in terms of establishment and job net and gross flows. For example, and of particular interest, the contribution of firm startups to the net and gross flows of establishments and jobs can be ascertained by using the tabulations of firm age zero. As described in detail below, establishments are assigned a firm age based upon the age of the parent firm. The age of the parent firm is based on the age of the oldest establishment in the firm. A firm age of zero represents a firm where all establishments in the firm are entrants in that year –– hence it is a new firm. By construction, tabulations of firm age zero represent establishment entrants that are part of a new firm. Most new firms are single–unit firms.
The BDS describes job flow and entry/exit patterns for establishments in the U.S. Currently the BDS provides two sets of statistics. The first describes establishment job flows and entry/exit patterns as a function of the characteristics of the establishment (age and size). The second describes establishment job flows and entry/exit patterns as a funtion of the characteristics of the firm (firm age and firm size) with which they are associated. We use two different measures of firm (establishment) size: actual firm (establishment) size and initial firm (establishment) size. Actual firm (establishment) size is defined as the average of year t–1 and year t employment. Initial firm (establishment) size is defined for any given consecutive two–year period as the size at year t–1 except in cases when year t–1 employment is equal to zero in which case initial size is year t employment. Initial firm (establishment) size categories are identical to those for firm (establishment) size.
Both establishment and firm age are computed from the data (see Becker et al.  and Davis et al. ). Birth year is defined as the year an establishment first reports positive employment in the LBD. Establishment age is computed by taking the difference between the current year of operation and the birth year. Given that the LBD series starts in 1976 observed age is by construction left censored at 1975.
Firm age is computed for all firms in the LBD from the age of the establishments belonging to that particular firm. A firm is assigned an initial age by determining the age of the oldest establishment that belongs to the firm at time of birth. Firm age accumulates with every additional year after that. Note that mergers and acquisitions and divestitures could lead to abrupt changes in firm age purely from establishment composition issues if we defined firm age in each year using age of the oldest establishment owned in that year.
Although the BDS is based on the same basic source data as the Census Bureau County Business Patterns (CBP) and Statistics of U.S. Business (SUSB) programs, differences in how the source data are processed lead to differences in the published statistics. The LBD program involves many edits and updates that are done for longitudinal consistency that are not done for CBP and SUSB. Since the BDS is sourced from the LBD, these differences are carried through to the BDS tabulations.
Nevertheless, the BDS tracks the CBP and SUSB quite closely. Figure 1 compares total employment in the CBP and LBD series. It is clear that the two series track each other closely. Both the CBP and the LBD use the same underlying data; however, each series imposes its own set of restrictions and edits on the universe of active establishments. One difference is that after being released the CBP is not further edited upon subsequent edits to the BR. The LBD series also imposes its own set of restrictions and edits that are unique to the LBD program including the use of name and address matching to eliminate duplicates and the use of algorithms that identify and clean up incorrect data entries in the employment series. Despite of these processing differences, the quantitative differences are not large and range within a band of 1.9 million workers with the LBD typically falling below the CBP numbers particularly in the second half of the series (due to the unduplication processing for the LBD).
Figure 1. County Business Patterns versus Business Dynamics Statistics Employment, 1977–2010.
Figure 2 presents results from comparing the CBP versus BDS net employment growth rate series for the in–scope economy by year. As before the two series track each other reasonably well. The biggest difference, a 2–point difference, is found at the beginning of the series. The discrepancy can be tracked mostly to differences in education and mining across the two series and due to the processing differences discussed above.
Figure 2. County Business Patterns versus Business Dynamics Statistics Net Job Creations Rates, 1977–2010.
Figure 3 compares the number of establishment births and deaths in the LBD and SUSB series. The alternative birth and death series track each other well. However, the LBD shows lower numbers particularly for births during census years (those ending in 2 and 7). The smoother LBD is the result of a series of algorithms designed to identify and retime incorrectly timed births and deaths that come about from census processing activities. The reassignment of births and deaths result in a smoothing of the series for those years. Note that the retiming algorithms have a clear impact on the birth series but have a weaker impact on the deaths series. This stems from an asymmetry in the number of incorrect births and deaths (the census does a better job at identifying deaths than births) as well as the relative difficulty in reassigning deaths for multiunit firms.
Figure 3. Statistics of U.S. Business versus Business Dynamics Statistics Establishment Entry and Exit, 1977–2010.
Since the data series on Business Dynamics Statistics are based on administrative rather than sample data, there are no issues related to sampling error. Nonsampling error, however, still exists. Nonsampling errors can occur for many reasons, such as the employer submitting corrected employment data after the end of the year as well as late filers. Other sources of error include typographical errors made by businesses when providing information. Such errors, however, are likely to be distributed randomly throughout the dataset.
Changes in administrative data sometimes create complications for the linkage process. The LBD addresses these issues in detail in order to avoid overstating openings and closings while understating expansions and contractions (Jarmin and Miranda, 2002) (304 KB).
The BDS data series are subject to periodic minor changes based on corrections in LBD records due to updates coming from new BR files (e.g., late filers are no longer considered deaths).
 The U.S. Census Bureau has maintained a general–purpose business register since 1972. The Business Register (formerly known as the Standard Statistical Establishment List or SSEL) describes U.S. business establishments and companies. The Business Register is continuously updated with administrative data from other federal agencies, as well as data collected by the Census Bureau. Information for single establishments and administrative units of multi establishment companies (EINs) is updated based on payroll tax records from the Internal Revenue Service (IRS). Information for establishments of multi–unit companies is updated annually based on responses to the Company Organization Survey. Other routine sources of update information include Census Bureau current surveys (e.g., Annual Survey of Manufactures) and the economic census.
The Synthetic Longitudinal Business Database (SynLBD) is a beta version of a public–use synthetic longitudinal business microdata product that provides researchers a way to explore relationships in the microdata while protecting the confidentiality of establishments' information.