I'd argue inflation and high interest rates have a large impact too. When every day necessities (shelter, food, healthcare, education) are +30% at a minimum, there's not a lot leftover for fancy cars for most Americans.
How does the wealth gap cause inflation?
We've printed money a dozen times in the 30 years prior to 2022. Economists predicted that all of them would cause inflation. None of them did.
In 2022 we had money printing and a supply side squeeze. Insisting that the inflation was caused by the money printing rather than the supply side squeeze takes incredible chutzpah.
Because they had a greater supply shock.