Book excerpt: Available for the first time with Macmillan's new online learning platform, Achieve, Modern Principles is a tour-de-force with a unique combination of vivid writing, up-to-date relevant examples, and online resources unlike any other textbook for this market. Tyler Cowen and Alex Tabarrok have long demonstrated their mastery at communicating economic principles in a clear, captivating way through their blog, The Marginal Revolution. And they are pioneers in online education. Their fully updated new edition has more high-quality material designed for online teaching than any other principles of economics textbook. Videos from Marginal Revolution University (MRU), Discovering Data questions, live links to FRED data, an e-book, and assessment all live under Macmillan's new learning platform, Achieve and combine to provide an online learning product for all types of learners whether in face to face, hybrid or pure online classes.