Zoë Cullen joined the Entrepreneurial Management Unit as an Assistant Professor in July of 2018.
Zoë received her Ph.D in Economics from Stanford in June 2016, and worked as the Chief Economist at an Asian Bank leading up to her appointment at HBS.
The old boys’ club refers to the alleged advantage that male employees have over their female counterparts in interacting with powerful men. For example, male employees may schmooze with their managers in ways that female employees cannot. We study this phenomenon using data from a large financial institution. We use an event study analysis of manager rotation to estimate the causal effect of managers’ gender on their employees’ career progression. We find that when male employees are assigned to male managers, they are promoted faster in the following years than they would have been if they were assigned to female managers. Female employees, on the contrary, have the same career progression regardless of the manager’s gender. These differences in career progression cannot be explained by differences in effort or output. This male-to-male advantage can explain a third of the gender gap in promotions. Moreover, we provide suggestive evidence that these manager effects are due to socialization between male employees and male managers. We show that these manager effects are present only if the employee works in close proximity to the manager. We use survey data to show that, after transitioning to a male manager, male employees spend more time with their managers. Finally, we study a shock to socialization within males, based on the anecdotal evidence that employees who smoke tend to spend more time together. We find that when male employees who smoke switch to male managers who smoke, they spend more of their breaks with their managers and are promoted faster in the following years. Moreover, the effects of these smoking manager switches are similar in timing and magnitude to the effects of the gender manager switches.
The limited diffusion of salary information has implications for labor markets, such as wage discrimination policies and collective bargaining. Access to salary information is believed to be limited and unequal, but there is little direct evidence on the sources of these information frictions. Social scientists have long conjectured that privacy norms around salary (i.e., the “salary taboo”) play an important role. We provide unique evidence of this phenomenon based on a field experiment with 755 employees at a multibillion-dollar corporation. We provide revealed-preference evidence that many employees are unwilling to reveal their salaries to coworkers and reluctant to ask coworkers about their salaries. These frictions are still present, but smaller in magnitude, when sharing information that is less sensitive (seniority information). We discuss implications for pay transparency policies and the gender wage gap.
The vast majority of the pay inequality in an organization comes from differences in pay between employees and their bosses. But are employees aware of these pay disparities? Are employees demotivated by this inequality? To address these questions, we conducted a field experiment with a sample of 2,060 employees from a multibillion-dollar corporation. We make use of the firm’s administrative records alongside survey data and information-provision experiments. First, we document large misperceptions among the employees about the salaries of their managers and smaller but still significant misperceptions of the salaries of their peers. Second, we show that these perceptions have a significant causal effect on the employees’ own behavior. When they find out that their managers earn more than they thought, employees work harder on average. We provide evidence that these effects are consistent with career-concerns models. In contrast, employees work less hard when they find out that their peers earn more. We conclude by discussing implications for pay inequality and pay transparency.
Public discourse on pay transparency has not focused on equilibrium effects: how greater transparency impacts hiring and bargaining. To study these effects, we combine a dynamic wage-bargaining model with data from online markets for low-skill, temporary jobs that differ in their level of transparency. Wages are more equal, but lower under transparency. Transparency increases hiring and employer profits, rising 28% in an online field experiment. A key intuition is high transparency commits employers to negotiating aggressively, because a highly paid worker's salary affects negotiations with other workers. We discuss implications for the gender wage gap and employers' endogenous transparency choices.
This paper studies the growth of online peer-to-peer markets. Using data from TaskRabbit, a rapidly expanding marketplace for domestic tasks, we show that growth is highly heterogeneous across cities, which is a common feature of peer-to-peer markets for local services. To disentangle the potential drivers of growth, we present a general model of a frictional market for services, and estimate it using variation in the number of buyers and sellers present on the marketplace over time and across cities. First, we find that supply is highly elastic: in periods when demand doubles, sellers work almost twice as hard, prices hardly increase and the probability of requested tasks being matched only slightly falls. The first result implies that in markets where supply can accommodate wide fluctuations in demand, growth relies on attracting buyers at a faster rate than sellers. Second, we show that cities where the market fundamentals promote efficient matching of buyers and sellers are also the cities that grow fast in the number of buyers. This heterogeneity in matching efficiency is not attributable to scale economies, but is instead related to two measures of market thickness: geographic density (buyers and sellers living close together), and level of task standardization (buyers requesting homogeneous tasks). The second result implies that when network effects are limited by the local and time-sensitive nature of the services exchanged, growth of peer-to-peer markets largely depends on strategic geographic expansion.
