Kenneth Rogoff

Kenneth Rogoff is an American economist, born in Rochester, New York in 1953. Before economics he was a serious chess player: he became an International Master at eighteen and a Grandmaster in 1978, drew with world-class opponents including Mikhail Tal, and considered a professional chess career before deciding against it. He has described the decision as a recognition that he was unlikely to reach the very top and would rather do something else well.

He studied at Yale and completed a doctorate at the Massachusetts Institute of Technology in 1980, then worked at the Federal Reserve Board and the International Monetary Fund. He was Chief Economist and Director of Research at the IMF from 2001 to 2003, a period covering the Argentine default and a public disagreement with Joseph Stiglitz over the Fund's crisis lending conditions. He has been at Harvard since 1999.

His most durable technical result predates all of that. In 1983, with Richard Meese, he tested the structural models economists used to forecast exchange rates against a simple alternative: assuming tomorrow's rate equals today's. The random walk won at short horizons. The finding has been re-examined many times since and has largely held, and it is known as the Meese-Rogoff puzzle because the models fail despite being built on relationships that are demonstrably real.

With Maurice Obstfeld he wrote Foundations of International Macroeconomics in 1996, a standard graduate text. With Carmen Reinhart he wrote This Time Is Different in 2009, the quantitative history of financial crises. His own later book, The Curse of Cash, published in 2016, argues that large-denomination banknotes mainly serve tax evasion and crime and that phasing them out would also give central banks more room to act when interest rates approach zero.

The Meese-Rogoff result is the cleanest thing in Rogoff's work for an investor, and it is a negative result, which is why it has lasted. Exchange rates are determined by identifiable forces: interest rate differentials, inflation, trade balances, money supply. Models built on those relationships are not nonsense. They nonetheless forecast worse over short horizons than the assumption that tomorrow will look like today. The relationships are real and the forecasts still fail, which is a much more uncomfortable finding than the models simply being wrong.

What that suggests is a general caution rather than a claim about currencies specifically. Knowing the mechanism that drives a price is not the same as being able to predict the price, because the timing and magnitude of the drivers are themselves unpredictable and because expectations about them are already reflected. An investor who has correctly identified why something moves has not thereby acquired the ability to say when.

His crisis work with Reinhart operates at a different horizon and is complementary rather than contradictory. Base rates about how often defaults occur and how long recoveries take are statements about distributions across many episodes, and they survive precisely because they do not attempt to time anything. The two halves of his output make the same point from opposite directions: the long-run pattern is knowable and the next move is not.

The Curse of Cash applies the same instinct to a policy question. His argument is that large notes are used mainly for activity that avoids records, and that their existence constrains monetary policy by giving holders an escape from negative rates. It is contested, and the objections about privacy and about people without bank access are substantive rather than incidental.

The Meese-Rogoff result reshaped exchange rate economics by establishing a benchmark that structural models still struggle to beat, and it is routinely cited well outside currency work as evidence that identifying a driver does not produce a forecast.

His IMF tenure placed him at the centre of the argument about crisis lending conditions, and the public exchange with Joseph Stiglitz remains a reference point in debates about how the Fund should operate.

The Curse of Cash moved a technical monetary argument about the lower bound on interest rates into general discussion, though its proposals remain contested.