Economic models & behavioral assumptions
From Collins Dictionary of Economics
Economic models are used to summarize the essential characteristics of complex economic phenomena in order to simplify them and render them amenable to analysis. This normally requires the model-builder to make certain simplifying assumptions about human behaviour. For example, in order to analyse demand, economists assume that consumers seek to maximize their satisfaction (utility) and that they will rationally consume more of a product the price of which has fallen, and vice-versa.