For each of the examples below, explain if they correspond to one or none of the three models of price discrimination discussed in class. An explanation is required.

1. Uber increases the price of a ride during rush hour.

2. The local supermarket sells a box of blueberries for $4 and a pack of 3 boxes for $12.

3. The department store, Hudson's Bay, sends discount coupons in the mail to its loyal customers.

4. The internet provider offers a 50 GB plan for $80 and a 120 GB plan for $170.