Apple rumors of an iWatch, a game-changing TV, and magical 3D interfaces persist, fueled in part by CEO Tim Cooks opaque comments about entering new product categories. But whatever Apple is working on, its clearly requiring additional money for research and development. Apple spent a total of $4.475 billion over the 2013 financial year. Back in the days of iPhone development, however, Apple was proportionally investing double what it is now. Its difficult to compare Apples RD spend directly to its competitors — Microsoft, Google, Samsung, and even Amazon offer a far wider range of products and services.