How to define whether a sim is Rich?

I'm busy adding turn-ons and -offs to my sims. I like that my nobility can have rich sims as a turn-on, or at least poor sims as a turn-off. I pretend that this level of society will sometimes be loyal to their class rather than to their individual desires. An it makes sense that a duke will avoid romantic relations with women hardly making ends meet in a starter home.

But - I must admit I am not sure how the game calculates rich/poor.

Is it based on the household's cash alone? Or also the house? If so, how about a sim renting a home but buying/owning furniture? Owning a business?

It takes only §10,000 to avoid being poor, and §100,000 to be considered rich.

Game will almost never calculate networth correctly because I have so many assets in on-the-side notes. But it would still be good to know how the game thinks.