Commission
It can also make banks and other financial institutions do very nicely too, which is how many people come across it - by paying commissions!
In the world of banking, when there is a charge by a broker for undertaking some sort of trade, there is usually a commission that is taken on that trade.
Generally it is a fee that is either a flat fee or a percentage of a sale that is taken by a broker of some sort, whether it be a stock broker or a real estate broker.
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