Billionaires have a whole novel extra layer above this, as their taxable income and investment preferences can be significant for local (and sometimes national) governments.

What's described here affects everyone, and is a reason to something something Gini coefficient.

Someone on $1k/year can't afford for their $50 smartphone to get damaged or stolen; on $10k/year they can't afford for their fridge to break and their food to spoil; most of us are close enough to $100k/year to not need an example; $1M/year I can't imagine, as despite my close (logarithmically) to $100k income, my expenses are closer to $10k but without the stress of low earnings.

I want to get to the point where I can pay $10k for a first class cubicle on international flights and show up well-rested instead of having to lose a whole day to feeling like crap

Or $50k to book a charter flight and just have my driver take me straight onto the tarmac, thus avoiding the airport entirely

Or so rich that people come to you