. In my role as Mr. Money Mustache, I do my best to be your one-stop-shop for Lifestyle Guru ideas. So over the years we’ve covered not just the Money side of life, but also the even more important stuff like health and fitness and the psychology of better, happier living.  But there’s one single area of life where all of these factors come together with an almost Nuclear Fusion level of synergy and effectiveness. And because of that, if I could have one single wish in the world, this is what I would wish for. It’s a change so massive that it would make every person on the planet better off and fix most of our problems in one grand sweep. And it’s probably not what you’d expect: That we immediately switch to building our cities and countries around people, instead of cars. (and then fix all of our existing ones too, so that our entire world is built around person-friendly living.) The benefits of this are way bigger than almost anyone can imagine.…