I am curious why is height important? Understandably, income affects the lifestyle and opportunities, but what does height affect? What changes if you are several inch taller or shorter? I cannot understand. Also, why those who care about height so much do not go for basketball players? Also, the picture with income graph says "household income", not "personal income".
Height coorelates with lots of things. Taller means longer feet. Taller people have larger heads as well. A large head means larger cranial capacity and therefore, likely higher IQ. Mostly, it's just our monkey brain which says taller is more formidible.