He later expanded his argument to oppose any unfair earnings made in trade, basing the argument on the Golden Rule. He held that it was immoral to gain financially without actually creating something. The Christian should "do under others as you would have them do unto you", meaning he should trade value for value.
Although Aquinas believed all gains made in trade were wrong, he was willing to accept them as a necessary evil, provided the gains were regulated and kept within certain bounds, and provided they were directed toward a public good:
...there is no reason why gain [from trading] may not be directed to some necessary or even honourable end; and so trading will be rendered lawful; as when a man uses moderate gains acquired in trade for the support of his household, or even to help the needy...
In Aquinas' time, banking was still in its infancy. With the rise of banking and Capitalism, the just price theory was discredited by the Salamanca school and remains so today. In modern economics, interest is seen as payment for a valuable service, which is the use of the money.
Most banking systems still forbid excessive interest rates.
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