Transaction cost Definition
In economics and related disciplines, a transaction cost is a cost incurred in making an economic exchange. For example, most people, when buying or selling a stock, must pay a commission to their broker; that commission is a transaction cost of doing the stock deal. Or consider buying a banana from a store; to purchase the banana, your costs will be not only the price of the banana itself, but also the energy and effort it requires to travel from your house to the store and back, and the time waiting in line, and the effort of the paying itself; the costs above and beyond the cost of the banana as the transaction costs. When rationally evaluating a potential transaction, it is important not to neglect transaction costs that might prove significant.