You are sitting next to a person in business class on a flight from Los Angeles to Sydney, Australia. You mention to that person that you got your ticket two months ago for only $12,500. The person responds that she bought her ticket two days ago for $7,800. This sometimes happens because airlines often use an approach called:

price discrimination (third degree price discrimination)

Explanation:

Price discrimination is when the same product is sold at different prices to customers in different markets

types of price discrimination

1. first degree price discrimination : here sellers charge each consumer at their willingness to pay in order to eliminate consumer surplus.

2. second degree price discrimination : here firms offer different prices depending on the quantity purchased. e.g. giving discounts for bulk purchases.  

3, third degree price discrimination : firms charge different prices to different groups of customers. e.g. having a certain price for senior citizens, students  

answer; (d) i believe that the correct answer is ; /// a new invention lowers the cost of production;

a.