If you do something nice for people, it is natural for them to want to do something nice back to you. This is one of the reasons why creating a relationship with your list can be very lucrative for you in the long run.

If you give someone a gift, they feel a sense of obligation to help you out too. In this case, it might be buying a product.

In the last tip, I gave you 3 resources from Robert Cialdini – he writes about reciprocity in them. You can find those books here, here, and here.