Branded promotional items are a mainstay of corporate giving. On the surface, it's a simple enough endeavor. Logo some pens, Frisbees, or stress balls and you think you're good to go at your next trade show, but the science of corporate giving is a bit more complicated than that. The Promotional Products Association International did a study in 2011 of over 730 buyers and recipients of promotional products and found that recipients tended to be more favorably disposed to giv