This paper addresses the question of reform of the international monetary system. It starts by identifying the sources of disenchantment with the performance of the present regime of floating exchange rates and by outlining the reasons for the lack of convergence of views about the...

This paper deals with the relations among international liquidity,the exchange-rate regime and the effectiveness of monetary policy. The first part of the paper contains an empirical study of the demand for international reserves. It is shown that (i) reserve holdings are a stable function of a...

This paper argues that macroeconomic policies for open economies differ, in fundamentally important ways, from the corresponding policies for closed economies.The openness of the economy imposes constraints on the effectiveness and proper conduct of macroeconomic policies and it also provides...

Probably no event in monetary history has been more studied than the German hyperinflation of the early 1920's. Economists have been attracted to study this episode since it provides an environment that is close to a controlled experiment which is so rare in the study of social sciences. This...

This paper contains an analysis of the role of international reserves under a regime of pegged exchange rates and under a regime of managed floating. It presents evidence on the stability of the demand for reserves during the periods 1963-72 and 1973-75. It is shown that the demand for reserves...

I estimate a model in which new technology entails random adjustment costs. Rapid adjustments may cause productivity slowdowns. These slowdowns last longer when retooling is costly. The model explains why growth-rate disasters are more likely than miracles, and why volatility of growth relates...

This paper studies optimal investment policies when the production function depends on capital of various vintages. In such an environment it is natural to ask whether the firm will invest in old-vintage capital at all. In this paper I derive such a condition. Predictably, investment in old...

Aside from the equilibrium that Hotelling (1931) displayed, his model of non-renewable resources also contains a continuum of bubble equilibria. In all the equilibria the price of the resource rises at the rate of interest. In a bubble equilibrium, however, the consumption of the resource peters...

This paper extends Lucas (1978) to a production economy with two capital goods. It is an RBC model in which each unit of investment requires a new idea, an "option". When options are scarce, new capital is harder to put in place and the value of old capital rises. Thus the stock market and...

If machines are indivisible, a vintage capital model must give rise to income inequality. If new machines are always better than old ones and if society cannot provide everyone with a new machine all of the time, inequality will result. I explore this mechanism in detail. If technology resides...