Economics: you plot a demand curve by asking them, at regular intervals, how much they would pay for a parachute.

　
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  • 念經(jīng)濟的:每隔一段時(shí)間就問(wèn)他們，會(huì )付多少錢(qián)買(mǎi)一個(gè)降落傘，然后繪制一條需求曲線(xiàn)。
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