Free riding on the free market
It is very easy to free ride on the existence of markets themselves. I do it all the time when I go shopping.
My wife will ask me, "How much were the strawberries?"
"I have no idea."
"What? You didn't even check?"
"No: I trusted the free market."
In other words, when shopping, I often simply assume that prices are "right." If there were serious mispricing, the people who cut out 25 cent coupons and save them for weeks, and then take ten of them out of their purse at the checkout line, those people will have already spotted it. Thanks to them, I can simply pick up whatever items I want off the shelf and assume that I am paying roughly the "fair" price.