> If you define it based on salary you exclude people who are skilled but in locations, industries or professions that don't pay well, say barbers or teachers a

> If you define it based on salary you exclude people who are skilled but in locations, industries or professions that don't pay well, say barbers or teachers as an extreme example. Is that fair? I don't know. Shouldn't this be first class evidence that there is no shortage of barbers or teachers? If there were a shortage then you would pay them more.