These are fumdamental parts of daily social life.  One way or another, every person should learn about themselves (language), their environment (math), and cooperation with others (economics).  It doesn't need to be school that delivers those lessons, many learn them later in life.  But it's impossible to live a successful life without grasping the basics. 

 School does attempt to give you all of this information but what kids receive and what kids retain can be a huge difference. 

 It's hard to not retain something that you need to deal with daily.  It takes time & energy to create adults who can't balance a budget or answer the question "what is money?" but go and spend money every day 

 I can’t speak for everyone but personally, I retained very little from school because I just didn’t care. I had to develop genuine interest for information to stick.