The commission structure is negotiated by the seller and the listing agent and as a result leaves no responsibility to the buyer.
Today's commission rates generally are in the range of between 5 to 8 percent of the selling price. For the most part the normal rate id in the area of 6%.So if you the home were to sell for $200,000 at a 6& fee for professional services the amount due would be $12,000.
To take this a step further, this amount is split 50/50 between the listing agent and selling agent. Then each agent's broker gets a percentage. there's E & O Insurance, franchise fees, advertising, etc. etc. By the time each agent figures in their expenses, they would probably be lucky to take home $2,000. Oh, then there's the IRS.
Most people have no idea of the expense or time an agent invests in each transaction.
As a general rule, the better the agent and the firms marketing, the more they charge.
Commissions are shared with all brokers and agents involved in a transaction. How much is share is negotiated between brokers, but is a fair question to ask a prospective agent. The more they share, the more attention your listing will attract.
If you're buying, the seller pays the commission in most cases.
Best of Luck
Unfortunately, we, as Realtors, can't discuss what a "normal" commission is. The National Association of Realtors tells us that we can't. The reason is because commissions are completely negotiatable. There is no minimum and there is no maximum commission.
I'm guessing that you're thinking about selling and you don't know if you should list your home and pay a commission. My suggestion would be to call a few Realtors in your market area and interview them. "Don't Be Afraid" they're not going to bite you. This way you can get your commission question answered.
Keep in mind out of that 1.5% agents have to pay for their overhead expenses, office dues, auto expenses, realtors board fees, phones, internet, websites, business cards, and other items.