Microtrends: The Small Forces Behind Tomorrow's Big Changes categorizes approximately 75 microtrends seen in the modern contemporary world. Penn explains how relatively small subgroups of the population can launch effective social and political revolution. The majority of microtrends discussed are pertinent to the US, but the authors also touch on international trends and comparing them. The book also focuses on invisible trends in demography, sociology, business, family life, technologies, human interactions, and many other areas that are shaping the potential future in the world and society. Filled with statistics and lots of interesting trends, read it for an engaging and entertaining book.