The document discusses four electricity market models: 1) Monopoly Model - Vertically integrated utility with no competition 2) Purchasing Agency Model - Generation is competitive but transmission and distribution is controlled by a single utility 3) Wholesale Competition Model - Generation and wholesale markets are competitive but distribution is controlled by local utilities 4) Full Retail Competition Model - Competition exists in generation, wholesale, and retail markets. The document analyzes Pakistan's electricity market transition and notes that while privatization generated revenue, improved efficiency in the power sector has yet to be achieved.