MICHAEL MYNHARDT: Wealth equals health; With Africa's growing population - and a fast-emerging middle class - there's a case to be made for investment in the continent's health-care sector

Economics is unlike many of its academic cousins; it lacks the precision of engineering and physics, the vitality and urgency of medicine, the elegance of architecture, or even the pragmatism of accounting and finance. It's known as the "dismal science", stripping down human behaviour to quantifiable phenomena along lines of scarcity, supply and demand...