8. : The following figure shows two points of production, A and B, and the levelsof putpur for each input combination. Assume a manager moves from A to B. 60 Capital (19) 40 Q = 600 Q = 200 0 20 30 Labor-(4 4. The proportionate amount by which input usage increases, c, is b. The proportionate amount by which output increases, z, is - C. Sincecis (less than, equal to, greater than) z,- _ returns to scale are . present when the manager adjusts input usage from point A to point B