For a period of 20 years the existing Turkish customs tariff shall remain in force throughout the whole of the blue and red areas, as well as in areas (a) and (b), and no increase in the rates of duty or conversions from ad valorem to specific rates shall be made except by agreement between the two powers.

BBC: Map detailing the Sykes-Picot agreement

Meanwhile, exports rose 6.4%, driven up mainly by shipments of manufactured goods, the customs and tariff bureau said.

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Swaziland's government blames the financial woes on a drop in income from the Southern African Customs Union following a new tariff deal.

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Nor do they envisage a customs union, with a shared external tariff, since that would force either low- or high-tariff countries to make dramatic changes in economic policy.

ECONOMIST: Free trade in South-East Asia

But Cambodia already has an effective tariff of zero, thanks to its long and porous borders and corrupt customs officials.

ECONOMIST: But Cambodia's WTO membership may not make much difference