3. Alice runs a shoemaking factory that uses both labour and capital to make shoes. Which of the following would shift the factory’s demand for capital? Select one or more answers from the choices shown. [LO16.3]

a. Many consumers decide to walk barefoot all the time.

b. New shoemaking machines are twice as efficient as older machines.

c. The wages that the factory has to pay its workers rise due to an economy-wide labour shortage.