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Working Paper
Real Exchange Rates and Primary Commodity Prices
In this paper, we show that a substantial fraction of the volatility of real exchange rates between developed economies such as Germany, Japan, and the United Kingdom against the US dollar can be accounted for by shocks that affect the prices of primary commodities such as oil, aluminum, maize, or copper. Our analysis implies that existing models used to analyze real exchange rates between large economies that mostly focus on trade between differentiated ?nal goods could benefit, in terms of matching the behavior of real exchange rates, by also considering trade in primary commodities.
Working Paper
Liquidity Traps and Monetary Policy: Managing a Credit Crunch
We study a model with heterogeneous producers that face collateral and cash in advance constraints. These two frictions give rise to a non-trivial financial market in a monetary economy. A tightening of the collateral constraint results in a credit-crunch generated recession. The model can suitable be used to study the effects on the main macroeconomic variables - and on welfare of each individual - of alternative monetary - and fiscal - policies following the credit crunch. The model reproduces several features of the recent financial crisis, like the persistent negative real interest rates, ...
Discussion Paper
Self-fulfilling Prophecies in Sovereign Debt Markets
In this paper, we discuss conditions under which adverse expectations can trigger abrupt and large changes in the interest rate at which a sovereign country can borrow in international financial markets. We argue that such changes are caused by self-fulfilling expectations outcomes, in which interest rates are high because the perceptions of future defaults are high, but those perceptions are high precisely because the interest rates are high. {{p}} A model based on these elements successfully simulates the near-default experience of Greece, Italy, Spain and Portugal, among other countries. ...
Working Paper
Optimal devaluations
We analyze optimal policy in a simple small open economy model with price setting frictions. In particular, we study the optimal response of the nominal exchange rate following a terms of trade shock. We depart from the New Keynesian literature in that we explicitly model interna-tionally traded commodities as intermediate inputs in the production of local final goods and assume that the small open economy takes this price as given. This modification not only is in line with the long-standing tradition of small open economy models, but also changes the optimal movements in the exchange rate. ...
Working Paper
Optimal Capital Taxation Revisited
We revisit the question of how capital should be taxed, arguing that if governments are allowed to use the kinds of tax instruments widely used in practice, for preferences that are standard in the macroeconomic literature, the optimal approach is to never distort capital accumulation. We show that the results in the literature that lead to the presumption that capital ought to be taxed for some time arise because of the initial confiscation of wealth and because the tax system is restricted.
Working Paper
Monitoring Money for Price Stability
In this paper, we use a simple model of money demand to characterize the behavior of monetary aggregates in the United States from 1960 to 2016. We argue that the demand for the currency component of the monetary base has been remarkably stable during this period. We use the model to make projections of the nominal quantity of cash in circulation under alternative future paths for the federal funds rate. Our calculations suggest that if the federal funds rate is lifted up as suggested by the survey of economic projections made by the members of the Federal Open Market Committee (FOMC), the ...
Working Paper
On the Risk of Leaving the Euro
Following the sovereign debt crisis of 2012, some southern European countries have debated proposals to leave the Euro. We evaluate this policy change in a standard monetary model with seigniorage financing of the deficit. The main novel feature is that we depart from rational expectations while maintaining full rationality of agents in a sense made very precise. Our first contribution is to show that small departures from rational expectations imply that inflation upon exit can be orders of magnitude higher than under rational expectations. Our second contribution is to provide a framework ...
Report
Optimal Capital Taxation Revisited
We revisit the question of how capital should be taxed. We allow for a rich set of tax instruments that consists of taxes widely used in practice, including consumption, dividend, capital, and labor income taxes. We restrict policies to respect promises that the government has made in the previous period regarding the current value of wealth. We show that capital should not be taxed if households have preferences that are standard in the macroeconomics literature. We show that Ramsey outcomes that must respect such promises are time consistent. We show that the presumption in the literature ...
Working Paper
Stock Market Volatility and Learning
Consumption-based asset pricing models with time-separable preferences can generate realistic amounts of stock price volatility if one allows for small deviations from rational expectations. We consider rational investors who entertain subjective prior beliefs about price behavior that are not equal but close to rational expectations. Optimal behavior then dictates that investors learn about price behavior from past price observations. We show that this imparts momentum and mean reversion into the equilibrium behavior of the price-dividend ratio, similar to what can be observed in the data. ...
Working Paper
Inside-outside money competition
We study how competition from privately supplied currency substitutes affects monetary equilibria. Whenever currency is inefficiently provided, inside money competition plays a disciplinary role by providing an upper bound on equilibrium inflation rates. Furthermore, if "inside monies" can be produced at a sufficiently low cost, outside money is driven out of circulation. Whenever a 'benevolent' government can commit to its fiscal policy, sequential monetary policy is efficient and inside money competition plays no role.