“One of the things that is constantly questioned is profitability. The thinking is mostly: the slave trade is so strange, you only drive it if you earn a lot from it. While, for example, an awful lot of slaves already died of infectious diseases while travelling across the Atlantic. I calculated that the Dutch slave trade was only an estimated 0.005 per cent of national income. So that is not much. Moreover, the Dutch slave trade is the only one that ceased to exist for economic reasons.”