如何理解在完全竞争条件下，商品的价格等于商品平均价格，这句话的意思，原理能解释一下吗

问题如下：

Which of the following descriptions is appropriate for a firm assuming it is in a perfectly competitive market?

选项：

A.

The marginal revenue per unit for the firm is equal to average revenue.

B.

The marginal revenue per unit for the firm is less than average revenue.

C.

The marginal revenue per unit for the firm is greater than average revenue.

解释：

A is correct.

In a perfectly competitive market, the firm is a price taker, therefore, marginal revenue, average revenue and sales price are equal.

考点：边际收益

解析：在完全竞争的条件下，具体的厂家都是价格的接受者。商品的平均价格=边际收益=商品售价