South Africa, Apartheid and Sanctions

This article is interesting in taking down the common claim that popular sanctions ended apartheid in South Africa and arguing, instead, that it was that Apartheid became economically unfeasible.

It's a tempting argument, and I'm happy to believe that the fall of many undesirable social systems was caused by economics rather than any moral imperative (see Anne Applebaum's Gulag - worth a read, by the way).

However, if the principle reason for the fall of apartheid was money, then sanctions surely exacerbated this?