What happens when making a purchase is quick and easy? You guessed it — people tend to buy more often. D’uh. It’s one of the most important marketing principles, especially in online marketing. But making it easy just as effective in the offline world. Here’s a great example. Despite the economic gloom, student applications to …

Buying anything online or from a TV infomercial these days seems to automatically include a one or more bonus items. (“And if you call right now, we’ll double your order!”) Would you rather get one (or more) free bonuses when you purchase a Snuggie or Sham-wow? Or would you rather buy them as a set, …