Gwen's decision to buy a new television instead of a bicycle for the same price a. means that opportunity cost is zero since both cost the same amount. b. would not have involved trade-off and opportunity cost if Gwen had decided to put the money in a bank CD instead. c. would not imply a trade-off because of scarcity if Gwen were a multimillionaire. d. means that the opportunity cost to Gwen is the bicycle that she has given up.