Explain the Gains from Trade of market.
Producer Surplus, Consumer Surplus, Gains through Trade and Efficiency of Markets:
Consumers and producers both are better off since there is a market into this good, that is there are gains by trade.
The maximum probable total surplus that is highest possible gain to society is attained at market equilibrium.
Into the market equilibrium there is no method to make some people better off without making others worse off markets are effective.