When you pay a price for something, you develop a right over it. If you buy a fruit, you have the right to eat it. A price paid gives you rights.
In the same way, if someone takes care of your certain needs or gives you some free favours, then he develops a moral right in some respects over you. Nothing comes free in the world. And the price of freedom is that you don’t take any favours or obligations from anyone.
When anything is free, your freedom could be the price !
– Sir Dr. Huz