In this paper, we present a dynamic optimizing model that allows explicitly for imperfect substitutability between different financial assets. This is specified in a manner which captures Tobin's (1969) view that an expansion of one asset's supply affects both the yield on that asset and the spread or "risk premium" between returns on that asset and alternative assets. Our estimates of this model on U.S. data confirm that some of the observed deviations of long-term rates from the expectations theory of the term structure can be traced to movements in the relative stocks of financial assets. The richer aggregate demand and asset specifications imply that there exists an additional channel of monetary policy. Our results suggest that central bank operations exercise a modest influence on the relative prices of alternative financial securities, and so exert an extra effect on long-term yields and aggregate demand separate from their effect on the expected path of short-term rates.

This article examines the role of money in a small-scale dynamic general equilibrium model of the euro zone estimated by maximum likelihood. The model allows for both intertemporal and intratemporal non-separability in preferences. We find, first, that real balances do not affect the marginal utility of consumption. Second, money demand shocks mainly help to forecast real balances while real shocks explain the bulk of price, output and interest rates fluctuations. Third, the calculation of the natural rate of interest reveals that the evolution of the interest rate is mostly accounted for by the real sources of fluctuations. Copyright 2006 Royal Economic Society.

From 1973 until 1984 OECD economies underwent a period of macroeconomic distress in which inflation escalated to reach an average rate of 13 percent, three times as high as in the previous decade. Since then, achieving low and stable inflation has become the main goal of monetary policy in western economies. This move in monetary policy making rests on the belief, firmly rooted in many economists' and politicians' minds, that the costs of inflation are nonnegligible, so that keeping inflation under control pays off in terms of faster sustainable growth in the future. The shortage of theoretical models explicitly addressing the issue of the long-run effects of inflation has not prevented many researchers from trying to estimate the costs of inflation. A series of recent papers have tried to assess the long-run impact of current inflation within the framework of convergence equations. These equations can be derived from a theoretical model of economic growth, and although the precise channels through which inflation affects growth are not always made explicit, they have several advantages for the purposes at hand. First and foremost, an explicit model reduces the risk of omitting relevant variables. Second, convergence equations allow for a variety of effects of inflation, including those that reduce accumulation rates and those that undermine the efficiency with which productive factors operate. Finally, in this framework a clear distinction can be made between level and rute-of

The Working Paper Series seeks to disseminate original research in economics and fi nance. All papers have been anonymously refereed. By publishing these papers, the Banco de España aims to contribute to economic analysis and, in particular, to knowledge of the Spanish economy and its international environment.The opinions and analyses in the Working Paper Series are the responsibility of the authors and, therefore, do not necessarily coincide with those of the Banco de España or the Eurosystem.The Banco de España disseminates its main reports and most of its publications via the Internet at the following website: http://www.bde.es.Reproduction for educational and non-commercial purposes is permitted provided that the source is acknowledged.

We examine the role of money in three environments: the New Keynesian model with separable utility and static money demand; a nonseparable utility variant with habit formation; and a version with adjustment costs for holding real balances. The last two variants imply forward-looking behavior of real money balances, with forecasts of future interest rates entering current portfolio decisions. We conduct a structural econometric analysis of the U.S. and euro area economies. FIML estimates con…rm the forward-looking character of money demand. A consequence is that real money balances are valuable in anticipating future variations in the natural interest rate.