Ghana is generally regarded as one of the more successful examples of an economic turnaround in sub-Saharan Africa. From an over-bureaucratic centralised state which led to a currency collapse in the late 1970s, Ghana has become a relative island of political stability and is thus encouraging inward investment. However, the economy remains over-dependent on two items, cocoa and gold, and recent falls in the world price of these commodities has led to recent exchange-rate problems.