Shedaoren 赊刀人,which means people who sell knives on prophecy.They usually appears in China's villages,To sell knives,Instead charging you money right away,They tell a prophecy,Usually some food price prophecy like rice going up and down,or fruits price,Some time involving a dynasty's fall or rise,Or plague.If they came true,Shedaoren will come back,and collect the money.Their prophecy doesnt always came true,If they came true,They will come back,They only sell knives.
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They claim themselves as student of Guiguzi which is allegedly teacher of Sun tzu,Shedaoren has very long history,The occupation used to be called 卜卖,which means"prophecy selling"
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Shedaoren are not a distant memory or extinct,They are very much alive and real,Today,They are still selling knives at villages or towns,Somewhere.