The answer is "specialization".
Specialization is a strategy for production whereby an entity centers around the creation of a restricted extent of products to pick up a more noteworthy level of efficiency. Numerous nations, for instance, spend significant time in delivering the products and enterprises that are local to their piece of the world, and they exchange for different goods and services.
Voluntary exchange is the demonstration of purchasers and dealers freely and readily captivating in market transactions. Besides, exchanges are made so that both the purchaser and the dealer are in an ideal situation after the trade than before it happened.