Working papers:

Using French administrative data on job-creating entrepreneurs, I estimate a life-cycle model in which risk-averse individuals can start businesses and return to paid employment. I estimate that the unobserved benefits of entrepreneurship represent 6,100 pre-tax euros per year (some 15% of profits), which adds up to 67,000 euros over the average entrepreneurial spell. For new entrepreneurs, the option of returning to paid employment is worth 82,000 euros. The main source of option value is not the unobserved heterogeneity in entrepreneurial abilities but rather the random-walk component of productivity. Together, unobserved benefits and this option value explain 42% of firm creations.

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R&R at the Review of Financial Studies

I structurally estimate a life-cycle model of portfolio choices that incorporates the relationship between stock market returns and the skewness of idiosyncratic income shocks. The cyclicality of skewness can explain (i) low stock market participation among young households with modest financial wealth and (ii) why the equity share of participants slightly increases until retirement. With an estimated relative risk aversion of 5 and yearly participation cost of $290, the model matches the evolution of wealth, of participation and of the conditional equity share over the life-cycle. Nonetheless, I find that cyclical skewness increases the equity premium by at most 0.5%.

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with Thomas Chaney, Zongbo Huang, David Sraer and David Thesmar
R&R at the Journal of Finance

While a mature literature shows that credit constraints causally affect firm-level investment, this literature provides little guidance to quantify the economic effects implied by these findings. Our paper attempts to fill this gap in two ways. First, we use a structural model of firm dynamics with collateral constraints, and estimate the model to match the firm-level sensitivity of investment to collateral values. We estimate that firms can only pledge about 19% of their collateral value. Second, we embed this model in a general equilibrium framework and estimate that, relative to first-best, collateral constraints are responsible for 11% output losses.

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  • Labor Market Risk and the Private Value of Social Security

Social Security provides insurance against idiosyncratic income risk but exposes workers to systematic risk because benefits are indexed to the evolution of aggregate earnings. I calibrate a life-cycle model to compare workers’ certainty equivalent valuation of Social Security to its net present value discounted at the risk-free rate. I show that, overall, labor market risk reduces current workers’ private value of Social Security by 46%. This adjustment sums up to $11.4 trillions on the national scale and the equity premium is its main determinant. For workers under 30, the certainty equivalent of Social Security is negative. Exposure to systematic risk through Social Security peaks relatively late in the life-cycle.

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Works in progress:

with Paolo Sodini and Yapei Zhang

Using Swedish administrative panel data on individual’s wages and portfolio holdings, we show that countercyclical labor income downside risk reduces households’ willingness to invest in financial market. We start by computing the cross-sectional variance and skewness of wage growth by occupation and year from 2001 to 2013. Then, we show that occupations for which these measures of labor income risk correlate with stock market fluctuations have lower participation rates and invest a smaller share of their financial wealth in risky asset. In line with theoretical predictions, these effects are stronger for individuals with modest financial wealth. Finally, we also show that households invest less in assets whose returns negatively correlates with downside risk in their profession.

with Jean-Noël BarrotDavid Sraer and David Thesmar