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Briefing
What income inequality measures can (and cannot) tell us
In recent decades, income inequality has increased. But this doesn't mean that those with lower incomes are relatively worse off.
Working Paper
Mortgage defaults
We incorporate house price risk and mortgages into a standard incomplete market (SIM) model. We calibrate the model to match U.S. data, and we show that the model also accounts for non-targeted features of the data such as the distribution of down payments, the life-cycle prole of homeownership, and the mortgage default rate. In addition, we show that the average coefficients that measure the agents' ability to self-insure against income shocks are similar to those of a SIM model without housing (as presented by Kaplan and Violante, 2010). However, incorporating housing increases the values ...
Journal Article
The economics of sovereign defaults
Working Paper
On the cyclicality of the interest rate in emerging economy models: solution methods matter
We study the sovereign default model that has been used to account for the cyclical behavior of interest rates in emerging market economies. This model is often solved using the discrete state space technique with evenly spaced grid points. We show that this method necessitates a large number of grid points to avoid generating spurious interest rate movements. This makes the discrete state technique significantly more inefficient than using Chebyshev polynomials or cubic spline interpolation to approximate the value functions. We show that the inefficiency of the discrete state space ...
Working Paper
International reserves and rollover risk
Two striking facts about international capital flows in emerging economies motivate this paper: (1) Governments hold large amounts of international reserves, for which they obtain a return lower than their borrowing cost. (2) Purchases of domestic assets by nonresidents and purchases of foreign assets by residents are both procyclical and collapse during crises. We propose a dynamic model of endogenous default that can account for these facts. The government faces a trade-off between the benefits of keeping reserves as a buffer against rollover risk and the cost of having larger gross debt ...
Working Paper
International Reserves and Rollover Risk
We study the optimal accumulation of international reserves in a quantitative model of sovereign default with long-term debt and a risk-free asset. Keeping higher levels of reserves provides a hedge against rollover risk, but this is costly because using reserves to pay down debt allows the government to reduce sovereign spreads. Our model, parameterized to mimic salient features of a typical emerging economy, can account for a significant fraction of the holdings of international reserves, and the larger accumulation of both debt and reserves in periods of low spreads and high income. We ...
Working Paper
Computing business cycles in emerging economy models
We show that computing business cycles in emerging economy models using the discrete state space technique may be misleading. We solve the models of sovereign default presented by Aguiar and Gopinath (2006) using interpolation. We find that the simulated behavior of the spread is quite different from the behavior obtained using discrete state space. In fact, some of the results obtained by Aguiar and Gopinath (2006) using discrete state space are reversed when using interpolation. Our analysis thus provides a new set of benchmark results for quantitative models of sovereign default. ; Updated ...
Working Paper
Mortgage defaults
We present a model in which households facing income and housing-price shocks use long-term mortgages to purchase houses. Interest rates on mortgages reflect the risk of default. The model accounts for observed patterns of housing consumption, mortgage borrowing, and defaults. We use the model as a laboratory to evaluate default-prevention policies. While recourse mortgages make the penalty for default harsher and thus may lower the default rate, they also lower equity and increase payments and thus may increase the default rate. Introducing loan-to-value (LTV) limits for new mortgages ...