This book has two purposes. Our goal has been not only to present the major themes of the UCSB principles course clearly and comprehensively, but also to train your mind to reason logically and deducatively about economics. The second goal is as important as the first. Economics is a problem solving discipline which relies upon a process of logical deducative argument. As such, if you are to master economics there is simply no substitute for solving problems and developing the ability to reason logically and deducativly. Thus, this book confrontss you with problem after problem, so that if you work throught all the material diligently, you will master both the material itself and the problem solving skills necessary for examination success.