The endowment effect is only an "anomaly" if utility is linear.

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The endowment effect is the tendency for people to place a higher value on things they own than on things they do not own. This is considered an anomaly because it violates the assumption of rational behavior, which states that people should be indifferent between two options that offer the same utility. However, if utility is linear, then the endowment effect is not an anomaly, because it can be explained by the fact that people experience diminishing marginal utility from additional units of a good.

The Endowment Effect Is Only an "Anomaly" If Utility Is