The World Financial Crisis has shaken the fundamentals of international banking and triggered a downward spiral of asset prices. To prevent a further meltdown of markets, governments have intervened massively through rescues measures aimed at recapitalizing banks and through liquidity support....

Taking the mean-variance portfolio model as a benchmark, we compute the optimally diversified portfolio for banks located in France, Germany, the U.K., and the U.S. under different assumptions about currency hedging. We compare these optimal portfolios to the actual cross-border assets of banks...