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Foreign exchange reserves. --- Banks and banking, Central. --- Financial statements. --- Balance sheets --- Corporate financial statements --- Earnings statements --- Financial reports --- Income statements --- Operating statements --- Profit and loss statements --- Statements, Financial --- Accounting --- Bookkeeping --- Business records --- Corporation reports --- Banker's banks --- Banks, Central --- Central banking --- Central banks --- Banks and banking --- Currency reserves, Foreign --- Foreign currency reserves --- Foreign reserves (Foreign exchange reserves) --- International reserves (Foreign exchange reserves) --- Reserves, Foreign exchange --- Finance, Public --- Reserves (Accounting)

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Separate literatures study violations of uncovered interest parity (UIP) using regression-based and portfolio-based methods. We propose a decomposition of these violations into a cross-currency, a between-time-and-currency, and a cross-time component that allows us to analytically relate regression-based and portfolio-based facts, and to estimate the joint restrictions they place on models of currency returns. Subject to standard assumptions on investors' information sets, we find that the forward premium puzzle (FPP) and the "dollar trade" anomaly are intimately linked: both are driven almost exclusively by the cross-time component. By contrast, the "carry trade" anomaly is driven largely by cross-sectional violations of UIP. The simplest model the data do not reject features a cross-sectional asymmetry that makes some currencies pay permanently higher expected returns than others, and larger time series variation in expected returns on the US dollar than on other currencies. Importantly, conventional estimates of the FPP are not directly informative about expected returns, because they do not correct for uncertainty about future mean interest rates. Once we correct for this uncertainty, we never reject the null that investors expect high-interest-rate currencies to depreciate, not appreciate.