The massive corruption common in so many developing countries would be quite impossible if Western countries did not provide convenient opportunities to ship ill-gotten funds out of the country. It wouldn't make much sense for a ruler to store in his basement large quantities of stolen cash in his own country's currency. A corrupt ruler wants to be able to keep this money safe and to be able to spend it. And for this, he needs to convert it into a Western currency and store it in a bank abroad, where it can also earn investment returns and be bequeathed to his heirs.
Purchasing power parities are not a reasonable method for comparing households across countries or currencies. The reason for this is simply that PPPs are sensitive to the prices of all the commodities, goods and services, that households are consuming worldwide, with each commodity weighted in the calculations according to its share in international household consumption expenditure.
In 88 poor countries for which we have data, in each and every one of the 88, the PPP for food shows that poor people can buy less food than you would expect from the PPP that the World Bank is using. The reason for this is obvious on reflection. It has to do with the fact that most foodstuffs are tradable commodities: basic foodstuffs, such as rice, flour and beans, can easily be conveyed across national borders and their prices will therefore roughly mirror the exchange rates among currencies.
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