You are in the line to go see a movie when you suddenly realized you have lost your ticket. It would cost you $$10$ to buy a new ticket. Now you are deciding whether to buy a new ticket or not. Assuming you have enough money to buy a new ticket, you would always buy the new ticket as long as:

the new ticket is free.

your reservation price for it is equal or larger than $$20.$

your reservation price for it is equal or larger than $$10.$

the new ticket is less expensive than the first.