Some examples: http://blog.priceonomics.com/post/43085729257/the-street-kids-of-san-francisco http://blog.priceonomics.com/post/43085729257/the-street-kid... I

Some examples: http://blog.priceonomics.com/post/43085729257/the-street-kids-of-san-francisco http://blog.priceonomics.com/post/43085729257/the-street-kid... I'll agree, "most" is probably way off. It is greater than 0, but it could well be a negligible amount.