The most frequently found barriers to entry in oligopoly include
a. the presence of large numbers of rival firms, firms that are price takers, and the
likelihood of normal returns in the long run.
b. an inability to differentiate product, diseconomies of scale, and the need to advertise.
c. mutual interdependence, collusion, and the likelihood of government regulation.
d. the ambiguity of product groups and rising long-run average costs.
e. patents, large initial and continuing financial requirements, and access to basic inputs.
Interest rates
a. help ensure that only those projects with the greatest expected productivity will be
undertaken.
b. are not really needed in a modern planned economy.
c. arise solely because investment projects entail risk.
d. vary directly with the capitalized value of an asset.
e. are synonymous with the concept of expected rates of return.