I will say  to persuade someone you must make them interested about it ,make them buy it as a product for themselves or you say  buy one get on for free such as making  some deals.  Or   when you have something that people like you can sell   It to them.

If you want to persuade someone to buy   Valuables  or materials then you should make some good deals ,: buy one get one for free: buy  two for half price   Or you can describe how good it is.

If you are one of those people who needs help on how to presuade people to sell there product and make money to do this you must read the  stuff that I wrote on  the 2paragraph  or you can  think of some ideas