One advantage of a money system compared to a barter system is that

Ease of finding items

Explanation:

With bartering (trading) you may have to wait until the you find what you need and someone who needs what you have (example: I will trade horseback riding lessons for a car and they may not NEED or WANT riding lessons) - with money, you can just purchase what you need when you need it.

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed