The idiomatic expression "to happen in the market" means to occur or take place within a particular financial, economic or business context. Full definition
If «lemons» are worth $ 2,000 and «peaches» are worth $ 10,000, what happens in a market in which buyers can't tell the difference? (slaw.ca)
More new things happened in this market in 2013 than in 2012. (law21.ca)
When you trade the higher time frames you get a clearer picture of what is really happening in the market because most of the erratic market noise of the lower time frames is eliminated. (learntotradethemarket.com)