Why can actual business outcomes differ from the predictions of economic models? Use one example from the course material.

### The concept An economic model simplifies a situation to make a relationship easier to analyze. The assumption *ceteris paribus* holds other influences constant while examining one change. Real markets do not always behave that way: tastes, costs, policy, capacity, and other factors may shift together. A fashionable product can attract more buyers even while its price rises, because changing preferences increase demand. A model remains useful, but managers must check its assumptions against actual conditions. ### What a good answer covers - Explain that models simplify reality. - Define the role of ceteris paribus. - Identify a real-world factor that violates the assumption. - Use a supported example, such as fashion-driven demand or variable output after expansion. ### Terms - **Model**: a simplified representation used to analyze a situation. - **Ceteris paribus**: other relevant conditions held constant. ### Remember Treat a model as a guide whose assumptions must be checked against the case.