Final answer:
In a competitive market economy, there tends to be an overproduction of goods that generate external benefits and an underproduction of goods that generate external costs.
Step-by-step explanation:
In a competitive market economy, there tends to be an overproduction of goods that generate external benefits and an underproduction of goods that generate external costs.
For the good that generates external benefits, the market does not fully capture all the social benefits, resulting in an insufficient quantity being produced. On the other hand, for the good that generates external costs, the market does not consider all the social costs, leading to an excessive quantity being produced.
This imbalance occurs because externalities, like pollution, cause markets to fail in accounting for all social costs and benefits.