Exactly. There is no rule that says you cant compare a flow to a stock (as many here seem to believe). Its freqently done in economics, and in general it can be quite helpful to understand the size of the stock (as with your sports car example).

The comparison in the graph simply says that Apple’s market cap is approximately equivalent to the value of what 110 countries produce in a year. Nothing more, nothing less. There are certainly other interesting comparison one could make, but they dont undermine that fact.

I’m not sure what you mean by «mean». The comparison is simply one way of putting Apple’s market cap into a bigger perspective.

Data: IMF, NASDAQ, World Bank

Tools: RStudio; ggplot2