His book, Microtrends, published by Hachette Book Group USA with Kinney Zalesne, examines how small ideas can catch fire and lead to big changes. For example, Penn shows how a mere one percent of the American public, or 3 million people, can create a "microtrend" capable of launching a major business or even a new cultural movement, changing commercial, political and social landscapes. From December 2008 to December 2009, Penn authored a regular online column for the Wall Street Journal called "Microtrends", focusing on demographic trends in society and business. Microtrends appeared regularly in the Media & Marketing section of WSJ.com.
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