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South Africa is a middle-income, emerging market with an abundant supply of natural resources; well-developed financial, legal, communications, energy, and transport sectors; a stock exchange that is the 18th largest in the world; and modern infrastructure supporting a relatively efficient distribution of goods to major urban centers throughout the region. At the end of 2007, South Africa began to experience an electricity crisis. State power supplier Eskom encountered problems with aged plants, necessitating "load-shedding" cuts to residents and businesses in the major cities. Growth was robust from 2004 to 2007 as South Africa reaped the benefits of macroeconomic stability and a global commodities boom, but began to slow in the second half of 2007 due to the electricity crisis and the subsequent global financial crisis' impact on commodity prices and demand. GDP fell nearly 2% in 2009. Unemployment remains high and outdated infrastructure has constrained growth. Daunting economic problems remain from the apartheid era - especially poverty, lack of economic empowerment among the disadvantaged groups, and a shortage of public transportation. South Africa's former economic policy was fiscally conservative, focusing on controlling inflation, and attaining a budget surplus. The current government largely follows the same prudent policies, but must contend with the impact of the global crisis and is facing growing pressure from special interest groups to use state-owned enterprises to deliver basic services to low-income areas and to increase job growth. More than a quarter of South Africa's population currently receives social grants.