I am now reading the book Decadent Societies by R.M. Adams and on pp.66-7 he writes:
Quesnay's ideas, which fell on stony ground in France, showed their basic vitality when picked up by Adam Smith for incorporation in The Wealth of Nations and then put into practice by William Pitt the younger. But in France they remained the deadest of dead letters.
What is he talking about? I am more interested in the second allusion - did Pitt institute any reforms based on Quesnay's ideas?