David Martin's Videos (5)
Optimism vs Pessimism 02:13
Controlling your attitude David Martin Aug 14, 2013
352 views
Is the Road to the Sale passe'? 04:11
David Martin Jun 17, 2011
356 views
People hear what they want to hear 02:06
Good concept to know in sales David Martin Apr 8, 2011
273 views
The Theory of Contrast 04:37
Great Sales Concept David Martin Oct 20, 2010
178 views
David Martin 02:58
Motivational sales meeting David Martin Aug 25, 2010
273 views
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