I'm trying to solve the following problem:
Consider an exchange economy with 2 consumers and 2 goods. First, consumer A sets the price, then consumer B maximizes utility according to the price. Then consumer A must make the trade chosen by consumer B.
Now I'm wondering how I should calculate the resulting equilibrium and whether the equilibrium is Pareto optimal. Will consumer A be better off this way, or will consumer A be better off if they both treat prices as given?