This paper surveys the recent trends in currency investment. In particular, this paper focuses upon strategies which employ cross-sectional information across countries. First, I introduce a carry trade that is the most popular investment strategy. Next, I explain developments of momentum and value strategies. Then, the other strategies are classifi ed into two groups. The former group exploits macroeconomic information such external debts and output growth. The latter group employs information in fi nancial markets such as term spreads and cross-sectional spot exchange rate return correlations. Finally, I describe two future research directions.