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Ironically, knowing about your buyers' type alone is not going to help you regarding mastering an art of selling. An effective salesperson strives to learn or create such kind of tailor-made strategies to deal with diverse buyers personalities. 

https://thenationaltv.com/Soft%20Skills/unleashing-the-secrets-to-master-an-art-of-selling-part-iii

• Avoid scams by acting locally or paying with PayPal
• Never pay with Western Union, Moneygram or other anonymous payment services
• Don't buy or sell outside of your country. Don't accept cashier cheques from outside your country
• This site is never involved in any transaction, and does not handle payments, shipping, guarantee transactions, provide escrow services, or offer "buyer protection" or "seller certification"