Economic Profit Is a Performance Metric
To understand economic profit, it helps to distinguish between a performance metric and a wealth metric. A performance metric refers to a measure under company control, such as earnings or return on capital. A wealth metric, on the other hand, is a measure of value that - such as equity market capitalization or the price-to-earnings (P/E) multiple -depends on the stock market's collective and forward-looking view. Now, although these two types of metrics are distinct, they are related.
Every performance metric has a corresponding wealth metric. In theory, over the long run, a performance metric can be expected to impact its corresponding wealth metric. For example, consider the matching pair of earnings per share (EPS), a fundamental performance metric, and the P/E multiple, its corresponding wealth metric. The variables that determine EPS - earnings and shares outstanding - are numbers affected only by the company's actions and decisions. On the other hand, the P/E multiple, which is determined by the company's stock price, depends on the value of these actions and decisions assigned by the stock market. The company therefore influences the P/E ratio but cannot fully control it. Here is another way to think about the difference between the two: EPS is a current (or historical) fact but P/E is a forward-looking and collective opinion.
The key criterion for the pairing of a performance and wealth metric is