[nrdvana]

Its true that rich people often (always?) "have debts", but not true that they are "in debt" overall, otherwise they wouldn't really be rich anymore. Poor and middle-class people are often in debt in the sense that they have borrowed against their future earnings. For things like a house, borrowed over 30 years, the inflation on that amount really does benefit them. By the end of the loan, people who stayed in one house barely notice the cost of the mortgage, and if the intrest rate is low enough they may choose to deliberately not pay it off as they invest their current cash elsewhere. For things like a credit card, no the inflation doesn't really help anyhing.

If deflation were expected, rich people really would just leave money in a bank account (as long as investing gave smaller returns, or seemed too risky.) The inflation is an incentive for cash-rich people to put that cash to use instead of sitting on it. This can be a huge driver for the economy.

[SuperNinKenDo]

I didn't say that rich people are "in debt", I said they rely on debt and leverage.

A mortgage on a single home seems kind of like a special case, they tend to have unusual rules that insulate borrowers from the effect of interest rates to a certain extent, which otherwise work to cancel out the time-preference effect on money. Otherwise the working classes have their wealth tied to the sale of their labor, something (wages) which is notoriously sticky, hence a greater effect on them.

I don't disagree that the macroeconomic argument does incentivise rich people to use their wealth productively, but it is precisely this argument that relies on the idea that the wealthy have means available to them to protect the value of their wealth. You can't have the former and not the latter.