In my case I look at prices in ounces of Gold. I bought my house in 1986 an took on a land contract for the equivalent of 140 oz Au.
In 1976 a AMC Gremlin was about 10 oz Au. It lasted 10 years.
Priced in Gold Crude oil is quite low.
But US Wages in Gold are at a 70 year low.
It is possible to price any thing in commodities even other commodities.
Free includes debt-free!