00:01
So in a pure exchange economy, individuals can only improve their well -being by trading with each other and allocation in pareto optimal will is there.
00:11
There is no other allocation that can make one individual better off without making another individual worse off.
00:18
So to find the set of pareto optimal allocation, to find the set of pareto optimal allocation, so we can use the following step writing down the utility function, finding the marginal rates of substitution.
00:41
The utility function will be ua equals to xa into ya and ub equals to xb into yb.
00:54
So the marginal rates of substitution of the two individual is mrs, marginal rate of substitution, a equals to xa, ya, mrs, b equals to xb divided by yb.
01:19
So since the pareto optimality requires that the mrs of the two individual be equal, we can set the two mrs equals to each other and solve for the equation.
01:30
Then xa, ya equals to xb, yb, xa, yb equals to xb into ya, xa equals to xb, ya, yb...