Of course they do. But they don't set market levels . An employer who pays less than the market rate will struggle to fill his job. A landlord who charges more than the market rent will struggle to let his property.Employers set wage levels, landlords set rent levels.
Some people talk as though landlords and employers have only just suddenly become greedy and interested in making maximum profit. They've always been fucking greedy. It's just in the last twenty years market conditions have been ideal for maximum greediness.