You are generalising the case of San Francisco as if the rest of the world was payed $150K a year and was able to throw wads of cash to buy groceries in Uber cars.
It's still amazing to me to see that people don't realize the Bay Area//New York//Seattle are micro bubbles that don't represent the world or even the united states.
Yes, people in those cities are mainly rich Yuppies that don't mind throwing away money. Everywhere else I always try to remember that most people (70% I think) wouldn't be able to cover a 400$ unexpected expense.
The bubble is quite amazing. Outside of a very small number of cities (and even there it's probably largely confined to the upper end of income), most locals do not routinely take taxis/Uber on a daily, weekly, or probably even monthly basis.
The typical American owns a car that is probably a number of years old and drives to the grocery store to buy food which they cook at home.
