The primary difference between private goods and public goods is that:

a. private goods are consumed by private individuals whereas public goods are not consumed by private individuals.
b. private goods often yield externalities but public goods do not
c. property rights can be assigned to public goods but not to private goods.
d. public goods are nonrivalrous in consumption whereas private goods are rivalrous in consumption.

While cell phones with holographic keyboards are currently in the introduction stage of the industry life cycle, tablet computers are in the growth stage. in the context of this scenario, which of the following statements is true? a. the industry for cell phones with holographic keyboards will face greater competition than the tablet industry. b. while the industry for cell phones with holographic keyboards will focus more on product innovation, the tablet industry will focus more on process innovation. c. while the industry for cell phones with holographic keyboards can reap the benefits of economies of scale, the tablet industry will experience no such benefits. d. the industry for cell phones with holographic keyboards will face price competition, whereas, in the tablet industry, the mode of competition will be non-price.