Most agricultural products, like strawberries, are in a type of market called perfect competition.

草莓等大多数农产品都属于一种叫做完全竞争的市场。

And social interaction takes the form of a market exchange in which perfect competition leads to the most efficient outcome.

社会互动采取市场交换的形式， 其中完全竞争导致最有效的结果。