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Working Paper
Does Unemployment Risk Affect Business Cycle Dynamics?
Graves, Sebastian (2020-09-18)
In this paper, I show that the decline in household consumption during unemployment spells depends on both liquid and illiquid asset positions. I also provide evidence that unemployment spells predict the withdrawal of illiquid assets, particularly when households have few liquid assets. Motivated by these findings, I embed endogenous unemployment risk in a two-asset heterogeneous-agent New Keynesian model. The model is consistent with the above evidence and provides a new propagation mechanism for aggregate shocks due to a flight-to-liquidity that occurs when unemployment risk rises. This ...
International Finance Discussion Papers , Paper 1298

Working Paper
Trade Risk and Food Security
Leibovici, Fernando; Adamopoulos, Tasso (2024-02)
We study the role of international trade risk for food security, the patterns of production and trade across sectors, and its implications for policy. We document that food import dependence across countries is associated with higher food insecurity, particularly in low-income countries. We provide causal evidence on the role of trade risk for food security by exploiting the exogeneity of the Ukraine-Russia war as a major trade disruption limiting access to imports of critical food products. Using micro-level data from Ethiopia, we empirically show that districts relatively more exposed to ...
Working Papers , Paper 2024-004

Working Paper
Slow Learning
Christiano, Lawrence J.; Eichenbaum, Martin S.; Johannsen, Benjamin K. (2026-06-04)
This paper provides an analytic characterization of the speed of convergence under learning to a rational expectations equilibrium (REE) for a large class of multivariate models. We show that learning is slower when people's beliefs about model outcomes are more self-fulfilling. The paper also investigates which features of a model economy make beliefs more self-fulfilling, using variants of the simple new-Keynesian model and a medium-scale DSGE model. For empirically plausible specifications of these models, convergence of a learning equilibrium to the REE is so slow that analysis based on ...
Finance and Economics Discussion Series , Paper 2026-039

Working Paper
Usual Shocks in our Usual Models
Ferroni, Filippo; Fisher, Jonas D. M.; Melosi, Leonardo (2022-09-06)
We propose an event-study research design to identify the nature and propagation of large unusual shocks in DSGE models and apply it to study the macroeconomic effects of the Covid shock. The initial outbreak is represented as the onset of a new shock process where the shock loads on wedges associated with the model's usual shocks. Realizations of the Covid shock come with news about its propagation, allowing us to disentangle the role of beliefs about the future of the pandemic. The model attributes a crucial role to the novel Covid shock in explaining the large contraction in output in the ...
Working Paper Series , Paper WP 2022-39

Working Paper
Trade Risk and Food Security
Adamopoulos, Tasso; Leibovici, Fernando (2025-10-30)
International trade provides critical access to food, yet many food-importing countries protect agriculture even where productivity is low. We study how the risk of trade disruptions shapes food security, the global distribution of production, and optimal policy. We document that reliance on imported staples is linked to higher food insecurity, particularly in poorer countries. Exploiting the Ukraine–Russia war, we find that districts in Ethiopia more exposed to disrupted imports suffered sharper declines in food security. We develop a multi-sector model of trade with stochastic trade costs ...
Working Papers , Paper 2024-004

Working Paper
Debt Limits and Credit Bubbles in General Equilibrium
Phan, Toan; Vailakis, Yiannis; Martins-da-Rocha, V. Filipe (2019-10-11)
We provide a novel characterization of self-enforcing debt limits in a general equilibrium framework of risk sharing with limited commitment, where defaulters are subject to recourse (a fractional loss of current and future endowments) and exclusion from future credit. We show that debt limits are exactly equal to the present value of recourse plus a credit bubble component. We provide applications to models of sovereign debt, private collateralized debt, and domestic public debt. Implications include an original equivalence mapping among distinct institutional arrangements, thereby ...
Working Paper , Paper 19-19

Working Paper
Regressive Welfare Effects of Housing Bubbles
Graczyk, Andrew; Phan, Toan (2018-04-18)
We analyze the welfare effects of asset bubbles in a model with income inequality and financial friction. We show that a bubble that emerges in the value of housing, a durable asset that is fundamentally useful for everyone, has regressive welfare effects. By raising the housing price, the bubble benefits high-income savers but negatively affects low-income borrowers. The key intuition is that, by creating a bubble in the market price, savers' demand for the housing asset for investment purposes imposes a negative externality on borrowers, who only demand the housing asset for utility ...
Working Paper , Paper 18-10

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