ACCA Advanced Performance Management (APM) Practice Exam

When considering the impact of positive externalities on output levels, it is essential to recognize that positive externalities occur when the benefits of a good or service extend beyond the direct recipients of that good or service to third parties who are not involved in the transaction. In this scenario, the social benefits of the product exceed the private benefits experienced by producers and consumers.

As a result, the market typically does not account for these additional benefits, leading to a situation where the actual output is less than what would be socially optimal or efficient. This occurs because producers may not have the incentive to increase output to the level where the total social benefits are maximized, as they only consider the private benefits in their decision-making. Consequently, the actual output level falls short of the efficient output level, which is where marginal social benefit equals marginal social cost.

In summary, when positive externalities are present, the actual output level is lower than the efficient amount of production due to the market's failure to recognize and incorporate the additional societal benefits. As a result, the correct understanding aligns with the notion that output will be less than the efficient amount of production.