I've heard a lot that women represent a massive portion of the world consumer economy. That makes sense to me, but I can't find legit sources on that. It seems I'm not the only one: https://blogs.wsj.com/numbers/do-women-really-control-80-of-household-spending-1054/

No one really knows where that came from.

Can you guys help me out here? Where would I even look for that?