Double may not be enough in a lot of cases but it doesn't need to be. A marginal pay raise has a marginal effect on the numbet of people who are willing to take

Double may not be enough in a lot of cases but it doesn't need to be. A marginal pay raise has a marginal effect on the numbet of people who are willing to take that job. While some people are willing to accept 2x the pay, it's possible to attract more people if 3x or 5x the pay is offered.