Apositive externality results when: a)someone pays for a good or service even though she is not directly affected by the production or consumption of it. b)people who are not directly involved in producing or paying for a good or service benefit from it. c)people who live in one country benefit from the production of a good or service that occurs in another country. d)economists are sure that a good or service provides benefits to consumers.

About 20 years ago, sturdy light, inc., produced a sturdy, lightweight backpack in a market that was rapidly growing. sturdy light became a leader in this market. eventually, the backpack market reached the maturity stage and slowed down. however, by this time, sturdy light had developed a strong brand name and continued to steadily lead the market. which of the following describes this scenario? a. sturdy light was a star that developed into a cash cow. b. sturdy light was a question mark that developed into a star. c. sturdy light was a dog that developed into a question mark. d. sturdy light was a cash cow that developed into a star.