Residual income is often also referred to as, “passive” or “recurring” income. Indeed, money makes the world go ’round. What better way to earn money than through letting money work for you even while you sleep? Surely, no greater method is available or even imaginable. The key here is to work smarter, not harder. Industriousness is required and you should be prepared to be very persistent. A common method of steadily earning residual income is through royalties earned from a book, song composition, software, or mobile application. Types of recurring income are not limited to royalties. Here are ten methods to begin earning.