1. What is meant by technological advance, as broadly defined? How does technological advance enter into the definition of the very long run? Which of the following are examples of technological advance, and which are not: an improved production process; entry of a firm into a profitable purely competitive industry; the imitation of a new production process by another firm; an increase in a firm's advertising expenditures?
2. Learning how to use software takes time. So once customers have learned to use a particular software package, it is easier to sell them software upgrades than to convince them to switch to new software. What implications does this have for expected rates of return on R&D spending for software firms developing upgrades versus those developing imitative products?
3. Why might a firm making a large economic profit from its existing product employ a fast-second strategy in relationship to new or improved products? What risks does it run in pursuing this strategy? What incentive does a firm have to engage in R&D when rivals can imitate its new products?