research | Ilya Eryzhenskiy, Economist

2025

Zero-Interest Green Loans and Home Energy Retrofits: Evidence from France

Ilya Eryzhenskiy, Louis-Gaëtan Giraudet, and Mariona Segú

R&R, Journal of the Association of Environment and Resource Economists , 2025

HAL Working paper, 2023

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We evaluate a zero-interest green loan (ZIGL) program implemented in 2009 to encourage home energy retrofits in France. We find eligibility to the program had a 20-22% impact on the extensive margin of investment and 3-5% on the intensive one, but only in the first two years. The effect is most significant for low-income homeowners, which suggests credit constraints are an important barrier to energy efficiency. Using banking data to investigate the post-2011 failure, we find suggestive evidence that banks exploited prospective borrowers’ incomplete information to sell them their own loan products in- stead of a ZIGL.
Intergenerational Redistribution with Endogenous Constraints to Household Debt

Ilya Eryzhenskiy

Journal of Mathematical Economics, Feb 2025

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I study decentralization of optimal allocations in an endowment overlapping-generations economy where young agents face endogenous borrowing constraints. Lenders constrain credit because of limited commitment of borrowers: those can declare bankruptcy and only lose their ability to make savings for retirement in the future. The social planner can use lump-sum transfers and government debt in order to decentralize optimal allocations of consumption goods. I show that policies using government debt decentralize a larger set of optimal allocations, as opposed to balanced-budget policies with the same number of instruments per period. In addition, government debt always rules out equilibria where the private credit market does not operate and can rule out equilibrium steady states with binding borrowing constraints. The results are explained by incentives for saving and debt repayment under limited commitment, so they do not hold under common specifications of exogenous debt constraints.