In what year did Henry Ford implement the moving assemby line?

Which of the following is not a valid statement about research and development?

	A.	The large size of oligopolists enables them to finance the often large R&D costs associated with major product or process innovation, and the existence of barriers to entry into the industry gives the oligopolist some assurance that it can maintain any economic profit it gains from innovation.
	B.	The expected rate of return on R&D may be low or even negative for a pure competitor due to the easy entry by other firms.
	C.	Unlike purely competitive firms, monopolistically competitive firms have little incentive to innovate because they maintain economic profits through barriers to entry.
	D.	A pure monopoly might not be inclined to invest in research and development because it is already maximizing its profits with no threat of competition because of insurmountable barriers to entry.

Which of the following was most responsible for the industrial revolution in the United States?

	A.	The electric light bulb
	B.	The heavy plow
	C.	The automobile
	D.	The railroad