Default prior choices fixing Zellner's g are predominant in the Bayesian Model Averaging literature, but tend to concentrate posterior mass on a tiny set of models. The paper demonstrates this supermodel effect and proposes to address it by a hyper-g prior, whose data-dependent shrinkage adapts...

The economic repercussions of September 11th are unique in that never before have economists needed to forecast and examine the impact of an event of such magnitude. This paper explains many of the economic effects of September l Ith, from the initial aftermath to recent developments. These...

This Selected Issues Paper on Iran reviews that monetary factors are the main determinants of inflation in the country. Government spending out of oil revenues leads to large liquidity injections that the central bank accommodates owing to its efforts to prevent a significant nominal...

We show the importance of a dynamic aggregation bias in accounting for the PPP puzzle. We prove that established time-series and panel methods substantially exaggerate the persistence of real exchange rates because of heterogeneity in the dynamics of disaggregated relative prices. When...

“Program numbers” from a sample of IMF-supported programs are studied as if they were forecasts, through statistical analyses of the relationship between projections and outcomes for growth, inflation, and three balance of payments concepts. Statistical bias is found only for projections of...

A simple criterion based on the properties of the forecast error is presented to evaluate the accuracy of forecasts. The efficiency conditions of an optimization problem are used to show that under rational expectations the standard statistical conditions are necessary, but not sufficient to...

In a recent paper, Bai and Perron (2006) demonstrate that their approach for testing for multiple structural breaks in time series works well in large samples, but they found substantial deviations in both the size and power of their tests in smaller samples. We propose modifying their...

Firm-level fixed investment expenses are analysed using a large panel of US manufacturing firms from 1971 to 2007. Integrating the user cost of capital, q and accelerator theories of investment to one econometric specification, we estimate the impacts of sales growth, cash flow, the cost of...

This Selected Issues paper analyzes the sources of Mexico’s economic growth since the 1960s, and compares various decompositions of historical growth into trend and cyclical components. The role of the implied output gaps in the inflation process is assessed. The paper presents...