How do you sell when no one buys? Comment vendre l'orsque personne n'achete?

Well, there are always two possibilities;1. you sell,-2. someone buy! and there are always somebody who you can sell, which means, mostly a good seller can sell what ever she/he want. Os course not to everybody, but ........! The question is how good are the skills in sales and how hard the seller is willing to work!