Excellent advice from the late Sir John Cowperthwaite, Financial Secretary of Hong Kong in the 1960s:

Asked what is the key thing poor countries should do, Cowperthwaite once remarked: "They should abolish the Office of National Statistics". In Hong Kong, he refused to collect all but the most superficial statistics, believing that statistics were dangerous: they would led the state to to fiddle about remedying perceived ills, simultaneously hindering the ability of the market economy to work. This caused consternation in Whitehall: a delegation of civil servants were sent to Hong Kong to find out why employment statistics were not being collected; Cowperthwaite literally sent them home on the next plane back.

(Via Natalie Solent.)