Suppose I have a Ordinary Least Squares model of this form:
$Y = \beta_0 + \beta_1 X_1 + \beta_2 X_2 + \beta_3 X_1*X_2$
What would be an interpretation for the coefficient $\beta_3$? (Suppose that $X_1$ & $X_2$ are not binary)
For example:
$Y$ = price of house
$X_1$ = squared meters of the property
$X_2$ = number of bathrooms
