Suppose you and your roommate have the following agreement when it comes to cleaning your apartment: each person washes her or his own dishes after each meal. The principle of trade you just learned tells you that it would be more efficient if:

one of you wash all the dishes while the other did a different chore.

Explanation:

In simple words, if any person performs a particular task on a repeated basis for a considerable time period than there is a high chance that he or she will gain a significant level of efficiency in doing that task as compared to others.

This principle was first recognized and used by Henry ford who made his labor perform the same task in the factory which resulted in faster production with better quality.