Tanzania's exports are dominated by products whose price is weak - coffee, tea, cashew nuts and cotton.

BBC: Tanzania: Reforms under pressure

Coups can be a lucrative business, and although its main export is cashew nuts, Guinea-Bissau offers tempting opportunities.

ECONOMIST: A small country upholds an unfortunate tradition

Olam International got its start 19 years ago when Sunny Verghese set out to sell cashew nuts processed in Nigeria to customers at trading centers in New York and London.

FORBES: Magazine Article