Pareto Efficiency: A state of resource allocation where it is impossible to make one person better off without making another person worse off. Pareto efficiency is a necessary condition for allocative efficiency.
Marginal Rate of Transformation (MRT): The rate at which an economy must forgo one good to obtain an additional unit of another good, given the available technology and resources. The MRT is a key determinant of allocative efficiency.
Marginal Benefit (MB): The additional benefit derived from consuming one more unit of a good or service. Allocative efficiency is achieved when the MB of each good equals its Marginal Cost.