<prompt> Human: I have 6825 Thank You points on a Citi account. Citi gives me the option to apply them to credit a charge. Amazon allows me to shop with points.If I shop on Amazon with points, the 6825 Thank You points total a 54.60 credit. If I try to pay off a 54.45 transaction off the card, it costs 7259 Thank You points.Im better off buying something at Amazon with the points. Why is that?  <response>: It might be in Citis interest to show partners theyre a valuable partner themselves. Or Amazon kicks back a small commission to Citi for sending customers to Amazon, so Citi offers you a bonus because of that kickback theyre receiving. 