I find it hard to prove such saying that women are more economical than man. First of all a lot depends from a person and how that person was raised. Second, what does "more economical" really means? Women and men have different tasks, different work, different needs. For example while buying food, women will spend less than men, but they both will cook different meals. Men would spend less in building material store. Third, I have never heard that men would spend whole salary on a bag and shoes (emotional purchase). As well as I have never heard that women would buy as huge as possible tv (even if it would fit poorly in the room) just because it is big and bigger than neighbors tv.
Well, you definitely have some good points here... We are raised differently, and we are all unique so we can't generalize this. For sure there are women who are more economical than men and men who don't give a fuck who has bigger "something", there are exceptions everywhere.
In my case, my wife is the one who is more economical than me. More restrained and down-to-earth, so she takes much more care about money and how it's spent. I am happy about that, in marriage it's important that at least one of us has more sense and keeps the house in the right place.