Drive revenue and grow your business by using the powerful concept of scarcity Scarcity isn't just one of the key principles of influence, it's arguably the most powerful--invoking the kind of primal instincts that were essential to our ancestors' survival. It's also the explanation for why, in the mid-1990's, $29.99 Tickle-Me-Elmo dolls were being scalped for $7,000 apiece. And yet, for all its power, scarcity is a principle...