The marginal cost of Alexa's Guide to Street People and Their Pets is constant at $5. Alexa sells 5,000 copies per year at $20 per copy. She would like to increase readership and hold total profit constant. If the price goes to $15, how many copies must she sell?

Which of the following best explains why improvements in communication technology allow people to make better economic decisions? a. better communication makes it easier to get the information needed to come to a well-informed decision. b. improved communication devices make it more convenient for people to talk with each other while making decisions. c. reductions in waiting time that result from widely-available communication devices enable consumers to avoid making hasty decisions. d. faster communication allows consumers to avoid the information overload that makes decisions harder to make.