Consider the same setting as in the previous question.

Question

Suppose that firms are NOT owned by consumers.

Let s denote the size of the per-unit subsidy/tax given to the firms. Let positive values of s denote subsidies, and negative values of s denote taxes.

QUESTION: What is the value of s that maximizes total consumer well-being? (Note: Don't forget to add the sign in entering your answer, if necessary).