Over the past three days in Yokohama, top government and business leaders from Africa and Japan discussed what they see as an exciting future for booming African economies, at the Tokyo International Conference on African Development.

The optimistic narrative on Africa's economies is supported by rapidly growing populations on the continent, which is likely to create a massive market.

The United Nations predicts that the population for all of Africa will further expand to 2.5 billion people by 2050, at which point one in every four humans would be African.