Matthieu Lequien

Banque de France
31 rue croix des petits champs
Paris, France

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Institutional Affiliation: Banque de France

NBER Working Papers and Publications

May 2018The Heterogeneous Impact of Market Size on Innovation: Evidence from French Firm-Level Exports
with Philippe Aghion, Antonin Bergeaud, Marc J. Melitz: w24600
We analyze how demand conditions faced by a firm impacts its innovation decisions. To disentangle the direction of causality between innovation and demand conditions, we construct a firm-level export demand shock which responds to aggregate conditions in a firm’s export destinations but is exogenous to firm-level decisions. Using exhaustive data covering the French manufacturing sector, we show that French firms respond to exogenous growth shocks in their export destinations by patenting more; and that this response is entirely driven by the subset of initially more productive firms. The patent response arises 3 to 5 years after a demand shock, highlighting the time required to innovate. In contrast, the demand shock raises contemporaneous sales and employment for all firms, without any no...
November 2017Tax Simplicity and Heterogeneous Learning
with Philippe Aghion, Ufuk Akcigit, Stefanie Stantcheva: w24049
We study how strongly individuals respond to tax simplicity and how they learn about the complexities of the tax system. We focus on the self-employed, who can more easily adjust to tax incentives and whose responses directly stem from their own understanding of the tax system. We use new French tax returns data from 1994 to 2012. France serves as a good quasi-laboratory: it has three fiscal regimes – or modes of taxation – for the self-employed, which differ in their monetary tax incentives and in their tax simplicity. Two key features are that, first, these regimes are subject to eligibility thresholds; we find large excess masses (bunching) right below the latter. Second, the regimes impact different agents heterogeneously and have changed extensively over time. Taken together, these t...

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