i56.
Marvin Harris (1977), Cannibals and Kings, p 266. The Intensification Paradox is discussed (though not called that) by Richard G. Wilkinson (1973), Poverty and Progress, chapters 6, 10 and passim; and Ester Boserup, “Environment, Population and Technology in Primitive Societies”, in Donald Worster, ed. (1988), The Ends of the Earth, pp 23–38.