Earlier quoted context omitted.
How does that help you? The price of different foodstuffs varies wildly both in ancient Rome and today.
Exactly. Think of it as "scarcity distribution" if you will. The typical food basket cost a different amount then than now. And there are plenty of times when most people could barely afford to eat (e.g. the early industrial age, when most factory workers were barely paid a living wage). A good example of the differences that make this discrepancy so large is the price of salt. Just now, the department in charge of r…
I agree that it gets very vague when societies are as different as ancient Rome and a modern industrial country. But knowing what share of a person's income is spent on biological necessities (basic food and shelter) is meaningful and can be expressed in dollar terms to make it more understandable.