GDP is “per year” and market cap is just some absolute number, better to compare annual revenue or sth. I mean why one year? Why not 10 months and 8 days? Why

GDP is “per year” and market cap is just some absolute number, better to compare annual revenue or sth. I mean why one year? Why not 10 months and 8 days? Why not a decade? It’s totally arbitrary and you can only use GDPs to compare with other GDPs (or other annual totals).