Internships are a standard example. By definition, such skills won't help you get a better offer elsewhere. So if a firm gives you some firm-specific training, your productivity rises, but market forces don't force them to give you a corresponding raise. You are more likely to get firm-specific training without a dock in your pay. However, the difference between general and firm-specific training may be weaker than it seems.
Firms have reputations for giving raises, and often even have formal pay scales.
If one firm pays employees the full value of their firm-specific training, and another doesn't, the latter will not be able to attract employees in the first place. If this argument is right, then employees will have to accept lower pay for all costly training, but receive their full MVP wherever they work. B. Human capital theory sheds considerable light on this pattern. Because then they would only get to reap the benefits of education for 20 years instead of 40. 2. Opportunity cost of time is lower when you're younger, so you give up less income.