Marcie sells financial planning software to the investment community. The demand for her product has increased steadily over the last few years. In general, the demand curve can shift because as ________. a) an increase in the number of firms supplying the software to the market. b) higher incomes for consumers. c) higher production costs. d) the use of new technology to produce Marcie's product?
1) an increase in the number of firms supplying the software to the market
2) higher incomes for consumers
3) higher production costs
4) the use of new technology to produce Marcie's product