other is not increasing, then the individual will demand a greater amount of the item they're acquiring in comparison to the one they're giving up. However, if the two items complement each other, then the exchange ratios might remain constant. In situations where traders can improve their position by offering trades that are more favorable to complementary traders, they are likely to do so.

In an economy that uses money, the marginal utility of a given quantity of money is equivalent to the marginal utility