This paper uses three panel unit-root tests and finds that real per capita GDP for OECD countries and a European subsample converge stochastically for the period 1948-87 but not for the entire sample of 1900-87. For the postwar period, the differential in income gaps or speed of adjustment is...

We investigate the empirical relevance of structural breaks for GARCH models of exchange rate volatility using both in-sample and out-of-sample tests. We find significant evidence of structural breaks in the unconditional variance of seven of eight US dollar exchange rate return series over the...