Serious question: what would be the impact to the economy, if, for one day, no-one spent any money, but did the equivalent amount of spending before or after (i.e. there was no change to the averages)?

Related to consumerism; I would recommend reading the book "The Perfection Trap", which has an interesting take on the intersection between our economy and mental health. It really explained a lot for me, kind of an "aha" moment. Regardless of whether you strictly agree with every point made in the book, it does make you cast a critical eye to where we are headed on our current path of consumerism.