This paper develops a continuous-time stochastic model in which international risk-sharing can yield substantial welfare gains through its effect on expected consumption growth. The mechanism linking global diversification to growth is an attendant world portfolio shift from safe low-yield capital to riskier high-yield capital. The presence of these two types of capital captures the idea that growth depends on the availability of an ever-increasing array of specialized, hence inherently risky, production inputs. Calibration exercises using consumption and stock-market data imply that most countries reap large steady-state welfare gains from global financial integration.

The paper develops a model of exchange-rate and current-account determination for a small economy peopled by infinitely lived, utility-maximizing households. In this setting, a central-bank purchase of foreign exchange has no real effects when central-bank foreign reserves earn interest at the world rate and proceeds are returned to the public. In contrast, an increase in the monetary growth rate does have real effects, even in the long run. The model developed here implies that an increase in government spending may lead to a surplus on current account. The external adjustment process predicted by the model is one in which consumption, real balances, and external assets all rise or fall simultaneously.

We develop an analytically tractable two-country model that marries a full account of global macroeconomic dynamics to a supply framework based on monopolistic competition and sticky nominal prices. The model offers simple and intuitive predictions about exchange rates and current accounts that sometimes differ sharply from those of either modern flexible-price intertemporal models or traditional sticky-price Keynesian models. Our analysis leads to a novel perspective on the international welfare spillovers due to monetary and fiscal policies.

This paper uses an infinite-horizon model based on individual maximizing behavior to study whether explosive price-level paths unrelated to monetary growth--speculative hyperinflations--can be equilibrium paths under rational expectations. In a pure fiat money regime, speculative hyperinflations can be excluded only through severe restrictions on individual preferences; but when the government fractionally backs the currency by guaranteeing a minimal real redemption value for money, speculative hyperinflations are impossible, even if agents are not completely certain that they can redeem their money in any given period. The analysis also confirms that implosive price-level paths and divergent paths for capital asset prices are not equilibria under either monetary regime.

In the late 1970s, countries in Latin America's Southern Cone initiated attempts to lower domestic inflation rates through the progressive reduction of a preannounced rate of exchange-rate devaluation. The stabilization programs gave rise to massive capital inflows, real exchange-rate appreciation, and current-account deficits. This paper develops a stylized intertemporal framework in which the effects of a credible preannounced disinflation scheme can be studied. It is shown that even when agents have perfect foresight and markets clear continuously, the "capital inflows" phenomenon and the associated real appreciation may result. While unanticipated, permanent inflation changes are neutral in the paper, anticipated inflation is neutral only in exceptional circumstances. A preannounced disinflation operates by altering the path of an expenditure-based real domestic interest rate that depends on expected changes in the prices of liquidity services and nontradable consumption goods.

Several puzzling aspects of the behavior of United States stock prices may be explained by the presence of a specific type of rational bubble that depends exclusively on aggregate dividends. We call bubbles of this type "intrinsic" bubbles because they derive all of their variability from exogenous economic fundamentals and none from extraneous factors. Intrinsic bubbles provide a more plausible empirical account of deviations from present-value pricing than do the traditional examples of rational bubbles. Their explanatory potential comes partly from their ability to generate persistent deviations that appear to be relatively stable over long periods.

This paper investigates the spending and current-account effects of terms-of-trade shifts in a model where households maximize utility over an infinite planning period. In the framework developed here, an economy specialized in production must experience a fall in aggregate spending and a current surplus as a result of an unanticipated, permanent worsening in its terms of trade. The paper's model thus provides a setting in which the current-account deficit predicted by Laursen and Metzier, Harberger, and others fails to materialize.