A regression model should reflect reality. In economics, reality is explained by economic theory. Therefore, a regression model about economics should be based on economic theory, and the results must also be explained in terms of economics.
Coefficients of Simple Regression
Estimating a Consumption Function
The simplest form of consumption theory in economics states that “consumption is a function of income.” This macroeconomic relationship is written as
Consumption = f (income)
This equation is read as “consumption is a function of income.” The simplest functional form and the one most commonly used is the linear function.
Consumption = subsistence consumption + (marginal propensity to consume) ...