Notoriously underpaid jobs

The definition of an "underpaid worker" varies from person to person. Human nature being what it is, many people think that whatever they are earning places them in the "underpaid" camp. But there are some metrics you can use to break out the truly underpaid worker from the "feeling overworked" employee. One way is to compare a worker's salary with the average in the industry; another is to compare an income versus the average American wage.

Click through to take a look at 20 of the most notoriously underpaid jobs, both in absolute and relative terms.