Daniel Altman's guide on where to invest around the world in 2015. Three groups of factors will affect the ultimate success of a foreign investment: how much an asset's value grows, the preservation of that value while the asset is owned, and the ease of bringing home the proceeds from selling the asset. Each of these groups of factors requires a different kind of assessment. It's not enough to worry only about rates of return, corruption, political stability, investor protection, or exchange rates alone. The BPI combines these factors into a summary statistic that conveys a country's basic attractiveness for investment. (Note: * denotes not applicable)