Entrepreneurial Spillovers Across Coworkers
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Individuals Who Work With 1 Standard Deviation Higher Share Of Entrepreneurial Coworkers are 2.5pp More Likely To Become Entrepreneurs, An 8% Increase Relative To Mean.
Melanie Wallskog, “Entrepreneurial Spillovers Across Coworkers,” Stanford University, November 11, 2021,
http://wallskog.su.domains/files/wallskog_jmp.pdf
Firm stats, “…Beyond firm survival, I explore other measures of firm success, including size, in terms of employment, payroll, and revenue, and revenue productivity. As shown in Table9, the patterns are generally similar to those for firm survival: individuals who work with more entrepreneurs tend to start “worse" firms, unless their entrepreneurial coworkers themselves were successful. For example, in column 1 of Panel A, I find that a one standard deviation (14.7 percentage point) increase in the share of coworkers who were recently entrepreneurs predicts 5.5% lower entry year employment. Yet, as column 2 shows, this pattern is offset if the entrepreneurial coworkers ran large firms | i.e., if their entrepreneurial firms were in the top 10% of entry year log employment, amongst firms that entered in the same year and industry: conditional on general exposure to entrepreneurial coworkers, a future entrepreneur with a one standard deviation (3.8 percentage point) higher share of coworkers who were entrepreneurs to particularly large firms has 4.3% higher entry year employment.As Panel B shows, these patterns persist with the inclusion of entrepreneurial firm industry fixed effects: individuals' future entrepreneurial success is predicted by their coworkers' success, even within the industry in which they start their firm. Table 9 shows similar patterns for the likelihood of a future entrepreneur's firm being in the top 10% of entry year employment, payroll, and revenue, relative to firms that enter in the same year and industry (where I measure entrepreneurial coworkers' successes by analogous measures). The one exception is in terms of revenue productivity, where on its own, general exposure to entrepreneurs predicts a marginally higher probability of starting a particularly productive firm (column 9), but this appears to be driven by the particularly productive coworkers (column 10). Conditional on exposure to entrepreneurial coworkers, a future entrepreneur who works with a one standard deviation (4.5 percentage point) higher share of coworkers who were entrepreneurs at particular high-productivity firms is on average 0.6 percentage points more likely to run a particularly productive firm, a 9.9% increase relative to the mean outcome.57These patterns suggest that what entrepreneurial coworkers teach individuals depends on the experiences of the coworkers, with successful entrepreneurs having a greater capacity to improve future entrepreneurs' prospects. In the remainder of this section, I consider additional outcomes that complement these standard measures and provide additional insight into the mechanisms of these spillovers….”
By Sector, “…Sector of individual's establishment Because workplaces and entrepreneurship patterns vary by industry, it is plausible that spillovers may vary dramatically across sectors.45 In fact, most sectors have similar coefficients to the aggregate coefficient, with some exceptions. Figure5shows the extensive margin spillovers by the sector of the individual's current establishment, estimated in a single regression by interacting the share of coworkers who were recently entrepreneurs with indicators for each sector, while continuing to include industry fixed effects that control for baseline differences in future entrepreneurship rates. There appears to be few spillovers for workers in the agriculture, utilities, and health sectors (which likely have high entry costs due to regulation) but substantial spillovers in the management and accommodation and food services sectors.46The fact that spillovers exist in most sectors but are strongest in the accommodation and food service sector suggests two conclusions. First, these spillovers exist across the economy | these spillovers are commonplace, and are not driven by the culture or structure of a single sector. Second, because the spillovers are largest in the relatively low-technology accommodation and food services sectors, these spillovers are unlikely to be predominantly transmitting knowledge of complex technologies or promoting innovation..”
“…Table 3 presents the point estimates from model (4) as controls are gradually added. As the table shows, individuals who work with proportionally entrepreneurial coworkers are more likely to become entrepreneurs in the future, regardless of the inclusion of controls. As more controls are added, this relationship decreases marginally but remains relatively stable. In the full speciation (column 8), the coefficient on the share of coworkers with entrepreneurial experience is 0.025: this predicts that an individual whose entire set of coworkers have entrepreneurial experience is 2.5 percentage points more likely to become an entrepreneur themself, compared to an individual who works with no entrepreneurial coworkers.27Recall that only 3.1% of the sample become entrepreneurs subsequently, such that 2.5 percentage points is very large relative to 3.1%, suggesting an 80% increase relative to the mean. However, this interpretation may be misleading, since very few individuals work with all former entrepreneurs. Instead, consider an increase in one standard deviation: the estimated model predicts that individuals who work a one standard deviation (9.5 percentage points) higher share of entrepreneurial coworkers are 0.236 percentage points more likely to become entrepreneurs in the next five years. This gap is still large: a 0.236 percentage point increase in the predicted future entrepreneurship maps into a 7.6% increase relative to the mean;28 this increase is comparable to the prior findings in the literature. To provide a simple evaluation of the size of this estimate, I conduct a back-of-the-envelope calculation to approximate how much the spillovers boost aggregate entrepreneurship. I predict the number of “additional" future entrepreneurs that start firms in the presence of spillovers by multiplying the coefficient on the share with the mean share of coworkers with entrepreneurship experience (0.03356) and the number of individuals (46.68 million). This calculation yields a predicted additional 39,000 future entrepreneurs, which amounts to a 2.75% increase. While this back-of-the-envelope calculation is inherently simple, ignoring any general equilibrium forces or dynamics of how spillovers aggregate over time, it does suggest a meaningful role for spillovers: spillovers boost aggregate entrepreneurship by 3%...”
Key finding“…I find evidence of positive extensive margin spillovers: individuals who work with one standard deviation (10 percentage points) higher share of entrepreneurial coworkers are 2.5 percentage points more likely to become entrepreneurs themselves within the next five years, an 8% increase relative to the average likelihood…”
The evidence
“…Entrepreneurial coworkers It is additionally important to note that coworkers with recent entrepreneurial experience were not necessarily the most productive entrepreneurs: indeed, many of their firms no longer exist, and they are now primarily employed at a different firm. As discussed below,this likely shapes the lessons that these coworkers can teach. Table2documents summary statistics on the firm outcomes for coworkers and individuals who were entrepreneurs within the previous five years (1999-2003).The table shows the outcomes both in terms of the average coworkers (columns 1 and 2, i.e., average outcomes for coworkers who were previous entrepreneurs) and at the individual level (columns 3 and 4, i.e., average outcomes for individuals who were previous entrepreneurs). For this paper, the past outcomes of the average set of entrepreneurial coworkers (columns 1 and 2) describe the average “treatment" that individuals face in the workforce. The average past outcomes of previous entrepreneurs in general (columns 3 and 4, many of whom started their current firm) provide benchmarks for the success of the average set of entrepreneurial coworkers. Table 2 highlights that entrepreneurial coworkers generally started relatively unsuccessful (i.e., shortersurviving, smaller, and less productive) firms, although some were relatively successful. Less than half of individuals' entrepreneurial coworkers started _rms that survive to age 5, on average, while over 60% of all recent entrepreneurs' firm ssurvive that long. Alongside these higher exit rates, many entrepreneurial coworkers have since returned to being a standard worker: while around 52% of the recent entrepreneurs in general started their current firms, less than 9% of an individual's entrepreneurial coworkers are entrepreneurs of the current firms, on average. This means that many of these entrepreneurial coworkers have left the firm they started and now work at someone else's firm. Yet, some entrepreneurial coworkers started relatively successful firms; for instance, on average 15% of entrepreneurial coworkers started firms that were in the top 10% of entry year log employment, amongst firms that started in the same year and industry as them. Taken together, these summary statistics suggest that exposure to entrepreneurial coworkers is likely quite different from, e.g., mentorship through start-up accelerator programs: the average entrepreneurial coworker did not start a hyper-productive firms.However, the fact that there is heterogeneity in these entrepreneurial coworkers' outcomes | some individuals get “lucky" and work with successful former entrepreneurs | allows me to explore the roles of both exposure to more entrepreneurs and to more successful entrepreneurs in SectionsIIIandIVbelow….”
“..Despite the fact that future entrepreneurs are different from workers in general, they work and become entrepreneurs across the economy. Figure2shows the sectoral composition of all individuals and future entrepreneurs, plotting the shares of all individuals compared to the shares of future entrepreneurs employed in each 2004 primary firm sector (based on NAICS codes), along with the share of future entrepreneurs' firms' entry year sectors. As the figure shows, future entrepreneurs work in all industries in 2004 and start firms in all industries, though they disproportionately work and start firms in construction, professional/ scientific/technical services (e.g., R&D and law and accounting services), and accommodation and food services, and less often appear in manufacturing and health, compared to the general workforce. Nearly half of future entrepreneurs start firms in the same sector as their 2004 establishment….”
Workers vs. entrepreneurs, “…Entrepreneurs are quite different from the general labor force. Yet, entrepreneurs work and start firms in all sectors of the economy, making the potential scope of entrepreneurial spillovers large. For the 2004 sample, in Table1 I present entrepreneurial, demographic, job, and establishment characteristics of all individuals in 2004 and of those who become entrepreneurs between 2005 and 2009. Relative to the general population, future entrepreneurs tend to be young, male, educated, White and Asian, born outside the U.S., higher earning, and working at smaller, younger firms.They also tend to work with more entrepreneurial coworkers, which I explore more systematically in the remainder of the paper. While entrepreneurs tend to be younger than workers, there is a distinct inverse-U relationship between age and entrepreneurship, as shown in Figure 1. Entrepreneurship rates by age peak around age 35, with the share of individuals aged 35 who are entrepreneurs being nearly double that of individuals aged 20 or 70….”
Summery statistics, useful factoids
Core findings, “…In my extensive margin analysis, I estimate regression models of whether individuals who work with more former entrepreneurs in 2004 are more likely to become entrepreneurs themselves subsequently, between 2005 and 2009. I find evidence of positive spillovers: individuals who work with one standard deviation (about 10 percentage points) higher share of coworkers who were entrepreneurs in the past five years are 8% more likely to become entrepreneurs themselves in the next five years, relative to the average likelihood. Through a back of- the-envelope calculation, this pattern suggests that spillovers generate an additional 3% of entrepreneurs in the aggregate. While the average extensive margin spillover is large (8%, relative of the mean),there is substantial heterogeneity. The spillovers tend to be amplified by exposure to relatively more successful entrepreneurial coworkers (i.e., entrepreneurs whose firms were relatively large or productive). While spillovers exist in most sectors, they are largest in the accommodation and food service sector, suggesting that the aggregate evidence of spillovers are not driven by the “high tech" sector that previous literature has studied….Additionally, these spillovers are stronger for younger individuals and do not exist for near-retirement individuals, with individuals learning" the most from their relatively older coworkers. The spillovers are strongest across coworkers who may be more likely to regularly interact in the workplace or to form mentorship relationships, namely coworkers who earn similar wages or who are of the same sex or immigration status. Finally, spillovers generate new entrepreneurs: individuals who themselves have recent entrepreneurial experience are not more likely to become entrepreneurs after working with more entrepreneurial coworkers, consistent with these individuals having had their own experiences and thus little to learn from entrepreneurial coworkers….”
Her basic story, “…I study the entrepreneurial outcomes of the individuals who become entrepreneurs between 2005 and 2009 and find evidence of both spillovers of institutional knowledge and entrepreneurial skill. I estimate regressions models of whether an individual's future entrepreneurial firm's characteristics vary if they were exposed to more entrepreneurial coworkers in 2004. I find that individuals who work with more entrepreneurial coworkers tend to start firms that are smaller in both employment and sales and are less likely to survive, consistent with a net pattern of individuals on average simply being inspired or learning the institutional knowledge needed to start a firm, as this leads to less productive individuals choosing to become entrepreneurs. However, if the individuals' entrepreneurial coworkers ran larger or longer-surviving firms, the individuals are more likely to start firms that are larger and more likely to survive. These results suggest scope for some true productivity gains via entrepreneurial skill spillovers, if the spillovers are from particularly successful entrepreneurs…”
Controls that address your concern, “… Coworkers are not randomly assigned to individuals, creating identification concerns, despite the rich set of controls included in the baseline specifications. For instance, entrepreneurship-prone individuals may cluster at firms or establishments for a variety or reasons not captured by the observable controls, such that the spillovers I measure may not be evidence of learning from coworkers. Instead, these spillovers may reflect firm or establishment effects, consistent with the literature of entrepreneurs “spawning" from their employers. Or, these spillovers may reflect pure spurious correlation, if these entrepreneurship-prone individuals work at firms for reasons entirely unrelated to entrepreneurship, for instance if they are also more educated. Additionally, individuals living and working in particular locations or industries may experience common business shocks that make entrepreneurship more or less attractive. I address these identification concerns through several robustness analyses. First, I show that these spillovers do not reflect entrepreneurial individuals simply clustering at certain firms or establishments. Instead, individuals disproportionately appear to learn from their true coworkers other workers at their establishment as opposed to other workers at the same firm but at other establishments or workers who work at the same establishment either before they joined or after they leave.Second, I show that these spillovers cannot be fully accounted for by selection into having specific coworkers; the results are not driven by individuals seeking out entrepreneurial coworkers. Instead, spillovers are also apparent from coworkers who joined an individual's establishment after they joined, whom the individual should not have been able to select on when choosing to join the firm. Finally, spillovers are not driven by local or industry common shocks, as the patterns persist with the inclusion of additional location and industry fixed effects. To further bolster a causal interpretation of the spillovers, I present direct survey evidence of entrepreneurial spillovers across coworkers. By linking individuals who become entrepreneurs to firm owners in a Census survey, I analyze reported motivations for these individuals' entrepreneurship. I find that the individuals who previously worked with more former entrepreneurs are more likely to report that they had an entrepreneurial role model who led them to start a firm. In other words, the individuals who I predict become entrepreneurs because of their exposure to entrepreneurial coworkers are more likely to report having an entrepreneurial role model, consistent with these spillovers actually existing…”
She doesn’t explicitly address that question but she does implicitly address it (in her words her goal)“…I find that if an individual interacts more with former entrepreneurs, then they are more likely to become an entrepreneur subsequently. I compare the future entrepreneurship of individuals who work with more coworkers who were recently entrepreneurs to those who work with proportionally fewer entrepreneurial coworkers. Effectively, I want to compare individuals who are very similar, both in terms of their own demographics and entrepreneurship experience and their current firms, but who have different exposure to entrepreneurial experience….”




The vc giants’ newfound contrition comes on the back of a gigantic tech crash. The tech-heavy nasdaq index fell by a third in 2022, making it one of the worst years on record and drawing comparisons with the dotcom bust of 2000-01. According to the Silicon Valley Bank, a tech-focused lender, between the fourth quarters of 2021 and 2022, the average value of recently listed tech stocks in America dropped by 63%. And the plunging public valuations dragged down private ones (see chart 1). The value of older, larger private firms (“late-stage” in the lingo) fell by 56% after funds marked down their assets or the firms raised new capital at lower valuations. 










Ed Comment: Doesn’t seem very convincing. Aren’t engineers/programmers who work for google more likely to become entrepreneurs? Many went there to learn/steal ideas from technological frontier.
Ed Comment:“how do they remove selection bias -- entrepreneurial people choosing to work together or idea rich environments logically producing entrepreneurs? That's different than learning from nearby entrepreneurs.”