“One of the most remarkable features of the global economy over the past fifteen years has been the striking surge of economic growth over much of sub-Saharan Africa,” Charles Collyns, assistant secretary for international finance at the US Treasury, advised earlier this month. We’ve heard this story before, of course, only to discover that the investment results fell short of the headlines. Is it different this time? Possibly. For some perspective, let’s spin a few numbers and take a look at an ETF that focuses on investing in the stock markets in this neck of the world.