I know it's harder to know for sure, but wouldn't a country's "revenues" (tax, other revenues) vs corporate revenues be better? A country doesn't have instant access to its GDP.

Or possibly just expenditure for both? I know borrowing can fill the gap between income/expenditure but it gives and idea of the actual cash that either entity can access.

> Revenue for a company and GDP for a country are at least broadly comparable.

It’s really not. One is a figure that a CPA (or whatever your country’s equivalent is) signs off on, reports, and is stored in or flowed through the reporting organization’s cash accounts and the other is a statistic represented by a figure that belongs to no organized entity whatsoever.