This review is a case of one book leading to another. When I read Carl Benedikt Frey’s The Technology Trap, one argument he raised as to why the Industrial Revolution arrived as late as it did, was the resistance to innovation by guilds. But beyond certain vague and probably romantic notions, what do I really know about medieval guilds? And thus I found myself sitting down with The European Guilds, a hefty 645-page book by economic historian Sheilagh Ogilvie, published in The Princeton Economic History of the Western World series. This meticulously argued book crushes the idea that guilds served the common good. Instead, argues Ogilvie, through their profiteering they held Europe in an economic stranglehold that lasted for centuries.