Pareto efficiency means the situation of resource allocation where the concept of 'net' is dominant. In other word, basically we need to make someone worse in order to make others better under this efficiency. To seek for the efficiency, it is necessary to build the decentralized market mechanism.
Pareto efficiency indicates an arrangement of resources wherein the notion of 'net' holds significant importance. Essentially, making someone's situation worse is required to enhance others' conditions within this efficiency. To attain efficiency, constructing a decentralized market system is necessary.