Real estate agent
Brokerage commissions

Economist Steven D. Levitt famously argued in his 2005 book Freakonomics that real estate brokers have an inherent conflict of interest with the sellers they represent because their commission gives them more motivation to sell quickly than to sell at a higher price. Levitt supported his argument with a study finding brokers tend to put their own houses on the market for longer and receive higher prices for them compared to when working for their clients. He concluded that broker commissions will reduce in future. A 2008 study by other economists found that when comparing brokerage without listing services, brokerage significantly reduced the average sale price.
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