There is a myth that Christmas benefits the economy.
I don't see how it benefits the economy when I get a gift that I wind up throwing out because it's useless. Which is what typically happens. Even worse, I keep the gift around for a few years, because I feel guilty about throwing it out right away. Thus the gift not only incurs costs on the giver, it incurs costs on me in the form of storage costs.
This is the broken windows fallacy. Mindless activity doesn't, like repairing broken windows, or digging holes and then refilling them, doesn't benefit the economy.