Since .... we see that if additional effort reduces the marginal cost of quality, then quality decreases with ... but may increase or fall with...
Increases in the effort parameter ... reduce effort and this increases the marginal
cost of quality, thereby reducing its optimal level. However, although increases in
... increase the value of cost reductions, increase effort and reduce the marginal
cost of quality, this effect is counteracted by the fact that increases in quality are
costly and a greater weight is attached to such increases.