投资 · 西方古典
大卫·李嘉图：政治经济学及赋税原理·摘录 156
大卫·李嘉图《政治经济学及赋税原理》· On the Principles of Political Economy and Taxation · 投资
Suppose that, after the improvement, wine falls to 45_l._ in England, the cloth continuing at the same price. Every transaction in commerce is an independent transaction. Whilst a merchant can buy cloth in England for 45_l._, and sell it with the usual profit in Portugal, he will continue to export it from England. His business is simply to purchase English cloth, and to pay for it by a bill of exchange, which he purchases with Portuguese money. It is to him of no importance what becomes of this money; he has discharged his debt by the remittance of the bill. His transaction is undoubtedly regulated by the terms on which he can obtain this bill, but they are known to him at the time; and the causes which may influence the market price of bills, or the rate of exchange, is no consideration of his.
出处：
https://www.gutenberg.org/ebooks/33310
定位：Excerpt 156 · 核对日期：2026-10-19 · 核验：短摘录
白话
核心是：英国酿酒技术改进后，酒价降到45镑，布价不变。但商人每笔交易是独立的：只要他能在英国以45镑买布，在葡萄牙按通常利润卖出，他就会继续从英国出口布。他的做法是：用葡萄牙货币买汇票，用汇票支付英国布款，至于这笔钱最后怎样，他不管；他关心的是获得汇票的条件，而这些条件在交易时是已知的。所以，即使英国酒价下降，只要布贸易仍有利润，布出口就不会停。做法是：分析贸易时，要区分每笔独立交易的动机和整体贸易平衡的调整。
上下文
李嘉图讨论技术改进后贸易如何调整，强调商人每笔交易独立决策，不受汇率变动原因影响。
今日一问
在做决策时，你是否能像商人一样只关注当前可确认的条件，而不被宏观波动的原因分散注意力？
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