When education is remunerated, pay differentials make no sense. At that point you aren't personally responsible for the cost of education, so the cost is offloaded to society and you're paid for you time. The only factor at that point is how much labor it takes to educate you and how that factors into future allocations of labor.
When you go through education, you become part means of production. The knowledge and skill imparted on you by the labor of others becomes a constant capital stored within you that is exhausted over the course of your life.
When education is remunerated, pay differentials make no sense. At that point you aren't personally responsible for the cost of education, so the cost is offloaded to society and you're paid for you time. The only factor at that point is how much labor it takes to educate you and how that factors into future allocations of labor.
When you go through education, you become part means of production. The knowledge and skill imparted on you by the labor of others becomes a constant capital stored within you that is exhausted over the course of your life.