If, like me you've never heard of "pay it forward", it just means when someone is kind to you, instead of 'repaying a favor' you show kindness to another person. It is a very nice way to spread a little love. I don't know if that made any sense, but I'm sure that you can google it and find out for yourself. On etsy, "Pay it Forward" means listing an item for no more than it takes to cover the listing fee and materials.
These are the items that I will be putting in my new store for $.50 each as "pay it forward" items: