Explain the principle "Make the poorest as well off as possible." Who proposed it?

What will be an ideal response?

This principle was proposed by John Rawls. According to this principle, taking all the costs of income transfer into account, the fair distribution of the economic pie is one that makes the poorest person as well off as possible. The incomes of rich people should be taxed, and after paying the costs of administering the tax and transfer system, what is left should be transferred to the poor. But the taxes must not be so high that they make the economic pie shrink to the point at which the poorest person ends up with a smaller piece. The goal is to make the piece enjoyed by the poorest person as big as possible.