Capable of being exchanged or substituted with equal value or effect.
From Latin 'aequus' (equal) + Middle English 'changeable' (able to be exchanged). The term emerged from mathematical and economic contexts where items could be swapped without loss.
In economics and game theory, equichangeable goods are the dream scenario—think of perfect substitute products like two identical brands of salt where one box is completely interchangeable with the other without any difference to the buyer.
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