Shoppers push trolleys at an upmarket shopping mall in Sandton, Johannesburg, September 23, 2015. Whether it's selling pensions, pasta or toothpicks, investors in Africa have been targeting the booming middle class. But a year of diving commodity prices has exposed how much the continent, and its consumers, still rely on exporting resources. A decade of growth above five percent in sub-Saharan African economies has drawn a wave of interest in selling consumer goods and providing services to a rapidly urbanizing population of 1 billion. To match Analysis AFRICA-MIDDLECLASS/ REUTERS/Mike Hutchings