Excess exports of poultry from the US or the EU are dumped onto Africa at subsidised prices, undermining local livelihoods and destroying local domestic industries.

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It has badly hurt farmers in poor countries, who have not only seen exports shut out by European tariffs but also suffered at home from dumped surpluses.

ECONOMIST: Farm subsidies

But more importantly, the U.S is also investigating whether Chinese exports of solar panels might have received illegal subsidies or have been dumped in the American market at prices below the cost of manufacturing them.

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It isn't just that subsidised exports lower prices in international markets: even in its home market, dumped American and European goods are undercutting South African produce.

ECONOMIST: South African farming