When is an exhange economy efficient?
When MRSxy = px/py (-px/py is the slope)
What is consumption efficiency?
All points on the contract curve
What are the three conditions for Pareto efficiency in the production and exchange economy?
1) Exchange efficiency = MRSxy = px/py
2) Production efficiency = MRTSlk = w/r
3) Allocative efficiency = MRSxy = MRTxy
All combined give us px/py = MCx/MCy