How does a $15/hr minimum wage affect wages of those not making minimum wage?
Increases in the minimum wage tend to cause firms to raise wages for those whose wages were initially above the new minimum in order to maintain the former pay hierarchy. The biggest effect is on workers closest to the minimum wage. There is also some evidence that firms shift hours to workers paid above the new minimum while reducing the hours of the least skilled workers whose wage rose due to the minimum wage. Both the higher pay and the higher hours will tend to raise income for those who were already paid above $15 per hour.