No one knows for sure why some societies are more innovative than others. The United States is a highly inventive society, the source of a host of technologies -- the airplane, the atomic bomb, the Internet -- that have transformed the world. Modern China, by contrast, is frequently criticized for its widespread copying of foreign inventions and creative works. Once the home of gunpowder, printing, and other transformational inventions, China is today better known for its knockoffs of almost every imaginable product: cars, clothes, computers, fast food, movies, pharmaceuticals, even entire European villages. The United States gave the world the iPhone; China gave it the HiPhone -- a cheap facsimile of a groundbreaking American gadget. ... Some see deep cultural roots to the pervasiveness of copying in China. But a more common view is that China fails to innovate because it lacks strong and stable protections for intellectual property. ... But American anxiety and anger over Chinese piracy are misplaced. Copying is not the plague that American business leaders and politicians often make it out to be. In fact, far from always being an enemy of innovation, copying is often a critical part of creativity. Although copying has a destructive side, it also has a productive side. Nearly all creations rest on prior work, and the ability to freely copy and refine existing designs fuels fields as varied as fashion, finance, and software. Copying can also foster stronger competition, grow markets, and build brands.