The price-quantity combination found where the supply and demand curves intersect is a unique combination that is efficient because

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At the point where the supply and demand curves intersect, the quantity supplied equals the quantity demanded. This means that the market is in equilibrium, and the price and quantity are efficient because they maximize total surplus. Total surplus is the sum of consumer surplus (the difference between the maximum price consumers are willing to pay and the actual price) and producer surplus (the difference between the actual price and the minimum price producers are willing to accept). At the equilibrium price and quantity, both consumers and producers are better off than they would be at any other price and quantity combination. Therefore, the efficient outcome is where total surplus is maximized.

The Price-Quantity Combination Found Where the Supply and Demand Curves