To make ends meet your economics instructor runs a telephone service, 1-900-psychihelp. Incoming calls are directed to available 'psychic' who work from their home and utilize their own telephone (not to mention their very special 'psychic' talents.) Consider this business and determine what you believe the nature of the marginal cost (per call) might look like. Explain, then provide a graph of the corresponding AFC, AVC, ATC, and MC curves.