Tā xiāngxìn shìjiè shàng méiyǒu zhēnzhèng de děngjiàjiāohuàn.
He believes there is no truly equal exchange in this world.
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usage
A core term in classical political economy (Marx) and a recurring philosophical motif in pop fiction. In Japanese, 等価交換 (tōka kōkan) is the foundational law of alchemy in 'Fullmetal Alchemist' — Chinese fans use the same term.