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Title: A Sufficient Statistics Approach for Aggregating Firm-Level Experiments

Author(s): David Sraer and David Thesmar

Publication Date: January 2018

Keyword(s):

Programme Area(s): Financial Economics, Industrial Organization and Macroeconomics and Growth

Abstract: We consider a dynamic economy populated by heterogeneous firms subject to generic capital frictions: adjustment costs, taxes and financing constraints. A random subset of firms in this economy receives an empirical "treatment", which modifies the parameters governing these frictions. An econometrician observes the firm-level response to this treatment, and wishes to calculate how macroeconomic outcomes would change if all firms in the economy were treated. Our paper proposes a simple methodology to estimate this aggregate counterfactual using firm-level evidence only. Our approach takes general equilibrium effects into account, requires neither a structural estimation nor a precise knowledge on the exact nature of the experiment and can be implemented using simple moments of the distribution of revenue-to-capital ratios. We provide a set of sufficient conditions under which these formulas are valid and investigate the robustness of our approach to multiple variations in the aggregation framework.

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Bibliographic Reference

Sraer, D and Thesmar, D. 2018. 'A Sufficient Statistics Approach for Aggregating Firm-Level Experiments'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=12592