Illicit capital flight, such as corporate tax avoidance, from the developing world is estimated at ten times the size of aid it receives and twice the debt service it pays, with one estimate that most of Africa would be developed if the taxes owed were paid. About 60 per cent of illicit capital flight from Africa is from transfer mispricing, where a subsidiary in a developing nation sells to another subsidiary or shell company in a tax haven at an artificially low price to pay less tax. An African Union report estimates that about 30% of sub-Saharan Africa's GDP has been moved to tax havens. Solutions include corporate "country-by-country reporting" where corporations disclose activities in each country and thereby prohibit the use of tax havens where no effective economic activity occurs.