It is from Joan Robinson, _Economic Philosophy: an essay on the progress 
of economic thought_, p. 45: 
 
"As we see nowadays in South-East Asia or the Caribbean, the misery of 
being exploited by capitalists is nothing compared to the misery of not 
being exploited at all." In ECONOMIC PHILOSOPHY, 1962, ch. 2. My copy is 
the Anchor Books, Doubleday $ Co., Garden City, NY. The original was C. 
A Watts & Co., Ltd. according to the info on the copyright page. 
 
Forstater, Mathew