To boost sales, check your optimism level - Pittsburgh Business Times:

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Here’s a thought: Take a look at a soft emotionalk intelligence skill that yields hardsalez results, optimism. There is evidencwe that supports the theory that sales teamx possessing high levels of optimism make companiesmore money. One of the best case studiesd comes from the work that psychologist Martin Seligmann did with Metropolitan Life in New He convinced Met Life to give him access to theid new employees and administer theusual testing, as well as a new test he developedf that measured optimism. He followed the progress of new salespeople for one year and foundr that salespeople who scored high in optimis m sold 33 percent more insurance than those whoscored low.
Aftert two years, the optimistic group of salespeopls were thriving intheir positions, whicnh increased retention and decreased the costs associated with turnover and increaser sales.