Matty's youth comes up again when, despite all he's seen at Trade Mart, he still wants a Gaming Machine and at least on some level, feels that whatever people are trading is worth it to get a fun and exciting toy. His disturbing story of the woman making fun of her husband draws a clear connection between trading and becoming less invested in caring for others, even those whom a person should in theory love above all else, like a spouse. Mentor's absent birthmark suggests that he's trading for conventional physical attractiveness—in other words, he no longer values difference.