Good predictors of success for business-to-business

What skills and traits have been found to be relatively good predictors of success for business-to-business institutional sales? What skills and traits have been found to be relatively good predictors of success for jobs involving the sale of services? Compare the salesperson characteristics most important in trade selling versus missionary selling. Compare the salesperson characteristics most important in technical selling versus new business selling. Respond to the statement, “Good salespeople are born not made.”