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.

Jamie is saving for a trip to europe. she has an existing savings account that earns 3 percent annual interest and has a current balance of $4,200. jamie doesn’t want to use her current savings for vacation, so she decides to borrow the $1,600 she needs for travel expenses. she will repay the loan in exactly one year. the annual interest rate is 6 percent. a. if jamie were to withdraw the $1,600 from her savings account to finance the trip, how much interest would she forgo? .b. if jamie borrows the $1,600 how much will she pay in interest? c. how much does the trip cost her if she borrows rather than dip into her savings?