It is bad to sell people defective goods
Hannah buys a vacuum from the store and it breaks immediately.
Hannah wants to get the money she spent on the vacuum back.
Hannah goes to the store where she bought the vacuum and asks for a refund.
Hannah sells the vacuum on Craigslist, saying it works perfectly.
Hannah gets a refund from the store after spending time and energy arguing with the manager.
Hannah gets her money back and feels guilty for cheating a stranger.