"Not everyone can move to optimize their relative adjusted income"--
Yes and not everyone can get married, and have a partner to share the load with either. So does that mean a bachelor and a married man should be paid different salaries?
Not everyone can find the time to run a side business. So should those who can be penalized?
You pay your employees what they are worth to the company and forget entirely about what they are and are not capable of doing outside of the company because it's really none of your business. If that means you can't find employees because you aren't willing to value an employee correctly than your company will fail, end of story.
Yes and not everyone can get married, and have a partner to share the load with either. So does that mean a bachelor and a married man should be paid different salaries?
Not everyone can find the time to run a side business. So should those who can be penalized?
You pay your employees what they are worth to the company and forget entirely about what they are and are not capable of doing outside of the company because it's really none of your business. If that means you can't find employees because you aren't willing to value an employee correctly than your company will fail, end of story.