Question: Consider the Leontief model (4).
(a) What is the interpretation of the condition that aii = 0 for all i?
(b) What is the interpretation of the sum ai1 + ai2 +···+ ain?
(c) What is the interpretation of the vector of input coefficients (a1j, a2j,...,anj )?
(d) Can you give any interpretation to the sum a1j + a2j +···+ anj?