Refers to the number of all the output buffer variable factors to increase another 1 unit, so note that increased use of each unit will affect the increase of productivity increase?
Represents the total output increased by 1 unit for variable factor to know. The increase in each variable factor will result in further increases in the productivity increase how much.
Mean number of total output increases when slack variable factor again 1 units, in order to know The rise of variable factor each unit will affect the increase of yield increase much.