Both Smith and Ricardo believed that, in a competitive market, product prices reflect "the cost of labor necessary to produce the products".
Answer: Option D
Explanation:
When there are a lot of manufacturers competing to provide the goods and services required for consumers, this is understood as "a competitive market". No single producer or customer can specify the market within a competitive market. It shares five traits: gain, diminishability, rivalry, exclusion, and rejectability. The wheat market is often drawn as an instance of a competitive market, as there are many manufacturers, and by increasing or decreasing its output, no single producer can impact the market price.