Harvard University

IN 1987, the unemployment rate in Massachusetts averaged 3.2 percent, three percentage points below the national rate. Only four years later, in 1991, it stood at 9.0 percent, more than two points above the national rate. For firms taking investment decisions and for unemployed workers thinking about relocating, the obvious question is whether and when things will return to normal in Massachusetts. This is the issue that we take up in our paper. However, instead of looking only at Massachusetts, we examine the general features of regional booms and slumps, studying the behavior of U.S. states over the last 40 years. We attempt to answer four questions. When a typical U.S. state over the postwar period has been affected by an adverse shock to employment, how has it adjusted? Did wages de-cline relative to the rest of the nation? Were otherjobs created to replace those jobs destroyed by the shock? Or did workers move out of the state? Our interest in these questions extends beyond regional economics. Blocs of countries, notably those in the European Community, are in-creasingly eliminating barriers to the mobility of goods and factors and moving toward adopting a common currency. Once these institutional changes are in place, economic interactions among these countries will more closely resemble those of U.S. states. This paper offers at least