If you are going to write a book proposing that giving aid to Africa is a bad idea, you are going to find it much easier to do if you are African.  If you are an African with a very solid background in economics so much the better.  As it happens Dambisa Moyo is ideally placed.  She was born in Zambia and has studied at several top UK and US universities and worked at Goldman Sachs.  So she can say things that a European or an American might find it much harder to say.