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Total surplus represents the sum of consumer surplus and producer surplus in a market. Consumer surplus is the difference between the highest price a consumer is willing to pay for a good or service and the market price they actually pay. Producer surplus is the difference between the price at which producers are willing to sell a good or service and the price they actually receive from the market. Total surplus, therefore, measures the overall welfare or gains from trade in a market.

Economic efficiency is a state in which resources are allocated in the best possible way to maximize the total surplus. In other words, economic efficiency occurs when the difference between the sum of consumer and producer surplus is maximized. This also implies that there is no potential for further gains by reallocating resources or producing additional goods or services.

The relationship between total surplus and economic efficiency is such that when an economy is at its most efficient point, the total surplus is maximized. This means that both consumers and producers gain as much as possible from their transactions, with no unexploited gains from trade left. In a perfectly competitive market, economic efficiency is achieved when the supply and demand curves intersect, leading to a market equilibrium. At this point, the market price and quantity produced ensure that all mutually beneficial transactions between producers and consumers take place. Therefore, the total surplus is maximized, and the market is economically efficient. In summary, total surplus and economic efficiency are closely related. The larger the total surplus, the closer the market is to achieving economic efficiency. Therefore, maximizing the total surplus reflects the efficient allocation of resources in the market.