Selling to someone is as simple as saying, "I can sell you this for this much, sound good?". Why they say "yes" is up to the product being sold, and the person being sold to. The better you understand that relationship, the more it makes sense.
Try selling a 100$ bill to someone. You could say something like "Hey man, I can give you a really good deal on this 100$ bill, you interested?".
"90$?"
"I can give you an even better deal! 75$ bucks and this 100$ is yours!"
"Ok, sure."
That's sales. The 100$ bill is be the product you're selling and all it takes is for the buyer to see it like that.
Try selling a 100$ bill to someone. You could say something like "Hey man, I can give you a really good deal on this 100$ bill, you interested?". "90$?" "I can give you an even better deal! 75$ bucks and this 100$ is yours!" "Ok, sure."
That's sales. The 100$ bill is be the product you're selling and all it takes is for the buyer to see it like that.