Answer: True
Step-by-step explanation:
Output is always maximised where Marginal Benefit is above Marginal Cost. Ideally speaking, Marginal Benefits should be equal to Marginal Costs but Marginal Benefits being greater than cost is still a good thing because it means that there is still room for expansion until such a point as the MB = MC.
However, if it starts costing more per unit to gain a benefit per unit MB < MC, the decision makers can know to limit the activity because this will cause losses. This is why it is better to make decisions at a Marginal level so that one may know when output is maximised as well as when to rein in production.