In competitive equilibrium some consumers (namely those who are willing to pay only less than the competitive equilibrium price) are shut out of the market. so are the producers whose cost of production is above the competitive equilibrium price. nevertheless, we say that competitive equilibrium is efficient. what is the intuition behind this? in other words, how do you understand the efficient outcome being one that does not allow consumers with valuation lower than the competitive equilibrium price and producers with costs higher than the competitive equilibrium price to do transactions in the market?