“For example, a brokerage representing a buyer in 2005 in the Greater Toronto Area would have earned a commission of about $8,795 on the average single-family home — while in December 2021, the buyer's brokerage would earn about $36,230, or four times more on that same home, according to Dr. Panle Jia Barwick, a leading economist on the real estate industries commission structure.

To put that jump in perspective, the median household income increased by just 14 per cent between 2005 and 2019, after adjusting for inflation.”

https://www.cbc.ca/news/marketplace/price-fixing-real-estate-1.6458531