Lower income households also have the highest mortality rates and shorter lifespan.

I´d argue higher income people spend money a lot more money on other things than the basics, like apparel, entertainment, travel, starbucks coffee, … Entire industries disappear when people can´t afford the products or services. In times of crisis, people stop certain spending and you get all the restaurants, hotels, amusement parks, fancy shops and so on crying they don´t get as much business anymore and slowly start to go bust.