The behaviour of Hongwu, the first of the Ming emperors, is an object lesson in how to stifle the economy: forbid all trade and travel without government permission; force merchants to register an inventory of their goods once a month; order peasants to grow for their own consumption and not for the market; and allow inflation to devalue the paper currency 10,000-fold. His son Yong-Le added some more items to the list: move the capital at vast expense; maintain a gigantic army; invade Vietnam unsuccessfully; put your favourite eunuch in charge of a nationalised fleet of monstrous ships with
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