Conversely, maybe the amount income people have to spend on entertainment is a function of their disposable income, so fixed by the persons financial circumstan

Conversely, maybe the amount income people have to spend on entertainment is a function of their disposable income, so fixed by the persons financial circumstances rather than entertainment costs. i.e. if you got $20 bucks spare and a movie is $20 you watch one, if they are $10 you watch 2. Over simplified, but I think an important point, that entertainment fits into the budget of 'disposable' income rather than essential.