Market Economies Tend to Under Invest in Research and Development

Market economies tend to under invest in research and development (R&D) largely because

A) firms do not like to hire scientists.
B) Americans are not good inventors.
C) there is not enough demand for high-technology products in the U.S. economy.
D) the payoff from R&D investment may be risky and uncertain.
E) high-technology stocks tend to be poor investments.