I am interested in an economic interpretation for the ratio of partial derivatives of a demand function $Q_1(p_1, p_2)$, which is \begin{equation} t=\frac{\frac{\partial}{\partial p_1}Q_1(p_1, p_2)}{\frac{\partial}{\partial p_2}Q_1(p_1, p_2)}. \end{equation} Assume the goods are complements so that both partial derivatives are negative.
This has the same form as the MRS in consumer theory, but the intuition does not readily apply.
I have been thinking about this as the ratio of demand sensitivities: if $t>1$ then the demand for good 1 is more sensitive to changes in $p_1$; if $t<1$, then the demand for good 1 is more sensitive to changes in $p_2$.
I would also say this is somewhat related to the cross price elasticity of demand, but the formula is not the same.
Any interpretations or intuitions would be great!