Consumers have been buying fewer cds as downloadable music has become easier to purchase and use. we would represent this as

a a leftward shift of the demand curve for cds
b a rightward shift of the demand curve for cds
c a change in the price of cds.
d a leftward shift of the supply curve for downloadable music

You are in the market for a new refrigerator for your company’s lounge, and you have narrowed the search down to two models. the energy efficient model sells for $700 and will save you $45 at the end of each of the next five years in electricity costs. the standard model has features similar to the energy efficient model but provides no future saving in electricity costs. it is priced at only $500. assuming your opportunity cost of funds is 6 percent, which refrigerator should you purchase