The process undergone and money lost to gain the desired object or outcome, such as spending gas to drive to the grocery store.
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Transaction Cost is the time, money, and effort spent to get what one wants. For example, in order to drive to the store and buy groceries, you must first spend effort and time to earn money, then you spend that money on gas to drive to the store and when you arrive on groceries, time is also spent driving to and from the store and shopping.