Read the information in the box. alex is casey set up for a garage sale. together, they are listening to a box of old cds to make sure that the cds work before they put price tags on them. alex enjoys a lot of the cds that casey plans to sell. if casey sells alex the box of used cds in a voluntary exchange, then a both casey and alex will benefit from the exchange. b casey will benefit from the exchange, but alex will lose. c alex will benefit from the exchange, but casey will lose. d the economic well-being of both will remain the same