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... em, the more precious it is. The harder it is to transport something, the higher the price and the more tempting the profit.
If Zheng Ruqian could make the ice last a little longer and travel a little faster, enabling the circulation of goods between cities, wouldn't he earn huge profits?
Of course there were downsides too, like not enough manpower. Hastily hired helpers might not be trustworthy enough. And whether or not the transported goods would have buyers was also an issue. ...
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