I think there's a big difference between market average and replacement cost. The average market value is (in theory) the average person in your field, putting

I think there's a big difference between market average and replacement cost. The average market value is (in theory) the average person in your field, putting in the average amount of effort. If you're putting in the minimum amount of effort, it's safe to assume that the amount of work you're doing can be replaced by somebody that's less talented than average. As such, you can be replaced for a lower annual salary. Point being is that your replacement value is directly related to job performance. If you're not doing an average amount of work, you are not worth the market rate.