The results of the Ming collapse were devastating. Between 1580 and 1650 conflict and epidemics reduced the Chinese population by between 35 and 40 per cent. What had gone wrong? The answer is that turning inwards was fatal, especially for a complex and densely populated society like China’s. The Ming system had created a high-level equilibrium – impressive outwardly, but fragile inwardly. The countryside could sustain a remarkably large number of people, but only on the basis of an essentially static social order that literally ceased to innovate. It was a kind of trap. And when the least little thing went wrong, the trap snapped shut.