Sliding Scale guide
The top price ticket is the actual cost of the service. If you choose a ticket price below the top tier you are receiving a discount.
The middle price is for those who are able to meet their basic needs but have little-to-no expendable income. Paying for this class may qualify as a sacrifice but it would not create hardship.
The bottom price is for those who struggle to meet basic needs and paying for this class would still be a significant hardship.