As soon as they order, they should get a stick letter that reassures them they made a good decision purchasing that product, and say,” By the way, I want to tell you, something brand new just happened, and you may be interested too. And since you’ve ordered this other thing, if you order right away, you get a special deal.”

That’s the most profitable time, usually in the selling cycle of the customers.

Gary Halbert, Gary Halbert: XXX, p.105