Asymmetric reference-dependent reciprocity, downward wage rigidity, and the employment contractJournal articleAlex Dickson and Marco Fongoni, Journal of Economic Behavior & Organization, Volume 163, pp. 409-429, 2019

We develop a model of asymmetric reciprocity and optimal wage setting based on contractual incompleteness, fairness, and reference dependence and loss aversion in the evaluation of wages by workers. The model establishes a positive wage-effort relationship capturing a worker’s ‘asymmetric reference-dependent reciprocity’, in which loss aversion implies negative reciprocity is stronger than positive reciprocity. Our theory provides an explanation for the observed asymmetry and dynamics of workers’ reciprocity and establishes a micro-foundation for downward wage rigidity, the implications of which shed new light on a forward-looking firm’s optimal wage setting and hiring decisions.

Forward to the Past: Short-Term Effects of the Rent Freeze in BerlinJournal articleAnja M. Hahn, Konstantin A. Kholodilin, Sofie R. Waltl and Marco Fongoni, Management Science, Forthcoming

In 2020, Berlin introduced a rigorous rent-control policy responding to soaring prices by capping rents: the Mietendeckel (rent freeze). The German Constitutional Court revoked the policy only one year later. Although successful in lowering rents during its duration, the consequences for Berlin’s rental market and close-by markets are per se not clear. This article evaluates the short-term causal supply-side effects in terms of prices, quantities, and landlords’ strategic behavior. We develop a theoretical framework capturing the key features of first-generation rent control policies and Berlin-specific aspects. Using a rich pool of detailed rent advertisements, predictions are tested, and further empirical causal inference techniques are applied for comparing price trajectories of dwellings inside and outside the policy’s scope. Mechanically, advertised rents drop significantly upon the policy’s enactment. A substantial rent gap along Berlin’s administrative border emerges, and rapidly growing rents in Berlin’s (unregulated) adjacent municipalities are observed. Landlords started adopting a hedging strategy insuring themselves against the risk of contractually long-term fixed low rents following a potentially unconstitutional law. Whereas this hedge was beneficial for landlords, the risk was completely borne by tenants. Moreover, the number of available properties for rent dropped significantly, a share of which appears to be permanently lost for the rental sector. This hampers a successful housing search for first-time renters and people moving within the city. Overall, negative consequences for renters appear to outweigh positive ones.

This paper was accepted by Victoria Ivashina, finance.

Funding: This research benefits from funding by the FNR Luxembourg National Research Fund [CORE Grant 3886] (ASSESS) and the OeNB Anniversary Fund [Grant 18767] (LocHouse). M. Fongoni further thanks the Department of Economics at the University of Strathclyde for support and acknowledges funding from the French government under the “France 2030” investment plan managed by the French National Research Agency [Reference ANR-17-EURE-0020] and from the Excellence Initiative of Aix-Marseille University - A*MIDEX.

Supplemental Material: The online appendix and data are available at