What is the primary principle behind ceteris paribus in demand analysis?

The primary principle behind ceteris paribus in demand analysis is that all variables are held constant except the one being studied. This principle allows economists to isolate the effect of a single variable—like the price of a good—on the quantity demanded while assuming that other factors, such as consumer income or preferences, remain unchanged. By doing so, it simplifies the analysis and helps to ensure that any observed changes in demand can be attributed specifically to the change in the price of the good in question, rather than confounding effects from other variables. This is crucial in creating clearer economic models and facilitating a better understanding of consumer behavior in response to price changes.