Relationship between TR and MR (When Price remains Constant)
In markets like perfect competition, the price of a commodity remains constant at all levels of output and any firm in the industry can not influence it. The sale of a product can be higher or lower at the same price only. Since MR remains constant and MR = AR, TR also increases at a constant rate. Hence, the TR curve is a straight line with a positive slope. As TR is zero at the zero level of output and increases at a constant rate with the increase in sales, the TR curve starts from the origin.
Relationship between TR and Price Line
When price remains same at all output levels, then Price = AR = MR. It means that the price line is same as the MR curve. We also know that, TR = ∑MR; therefore, the area under the price line or MR curve will be equal to TR.
In the above graph, TR at OQ output level is equal to OP x OQ which is equal to Area under price line.
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