Sal and jen went to the store together, and each bought the same car stereo. sal used a card to make the purchase, and the full amount was immediately withdrawn from his bank account. jen used a card to make the purchase, and she received a bill within 15 days of the purchase. she paid $21.30 for the next 18 months until the bill was paid in full. the full payment included $58.60 in interest. which statement describes sal’s purchase?

By 2020, automobile market analysts expect that the demand for electric autos will increase as buyers become more familiar with the technology. however, the costs of producing electric autos may increase because of higher costs for inputs (e.g., rare earth elements), or they may decrease as the manufacturers learn better assembly methods (i.e., learning by doing). what is the expected impact of these changes on the equilibrium price and quantity for electric autos?