On a Monday morning in Stockholm, the Royal Swedish Academy of Sciences announced that two American economists would share this year's Nobel Memorial Prize in Economic Sciences, honoring decades of work on a question that affects grocery bills in Buenos Aires as much as mortgage rates in Boston: how can governments and central banks smooth the violent swings between economic boom and bust? The laureates built models showing that recessions and inflationary spikes are not simply the unpredictable weather of markets but patterns that respond, at least partly, to timely policy. Their research examined how unemployment and rising prices interact, and under what conditions a central bank can lower one without inflaming the other. This tension, familiar to anyone who has watched the U.

S. Federal Reserve raise interest rates while workers wait anxiously for layoffs, has shaped economic policy from Washington to Brasília for half a century, yet it was rarely modeled with this level of rigor before their work. "We wanted to understand why some countries recover quickly from shocks while others spiral into years of stagnation," one of the laureates said in a telephone interview following the announcement, describing the puzzle that drove his career. The committee cited their analysis as essential to how finance ministries and central banks now calibrate interventions, from stimulus spending to interest rate changes, during downturns in economies as different as Germany's and Indonesia's.

The prize, worth 11 million Swedish kronor, or roughly $1 million, will be split between the two economists. Their work has already influenced real decisions: central bankers from Tokyo to Lagos have cited similar frameworks when justifying gradual rather than abrupt rate changes.