You are equating basic competition with the tragedy of the commons. Even if it were a zero sum game (which it is not) it still would not be an example of the t

You are equating basic competition with the tragedy of the commons. Even if it were a zero sum game (which it is not) it still would not be an example of the tragedy of the commons. The tragedy of the commons is when individuals have the option to consume, but do not have to bear the cost. They then choose to over-consume because they have no incentive not to. In your example the people who work 80 hours to afford a house, have to work 80, thus bearing the cost themselves.