Use the cost-benefit principle to evaluate the following: 

a. You are about to buy a calculator for $10, and the salesperson tells you that the model you want to buy is on sale for $5 at the store’s other branch, which is a 20 minute drive away. Would you make the trip?

b. You are about to buy a laptop for $1,000 and the salesperson tells you that the model you want to buy is on sale for $995 at the store’s other branch, which is a 20 minute drive away. Would you make the trip? 

c. Did you make the same choice in both cases? Should you have? Do you think this is how people actually choose?