I started in business journalism from the outside, so when I started writing about markets and business, I was struck by the fact that markets seemed to work well even though people are often irrational, lack good information and are not perfect in the way they think about decisions.
The traits the word 'childish' addresses are seen so often in adults that we should abolish this age-discriminatory word when it comes to criticizing behavior associated with irresponsibility and irrational thinking.