Well before the global financial crisis finally broke in September 2008, most people in developing countries were already reeling under the effects of dramatic volatility in global food and fuel markets. From late 2006, prices of most primary commodities first increased very rapidly, then collapsed even more sharply from their peaks in May-June 2008. This was not due to real economic forces, but rather financial activity, specifically the involvement of investors in index funds,writes Jayati Ghosh.