Please check the ISBN that your instructor provided. If the ISBN-13 does not match this product (9781111927509) or its Printed Access Card equivalent (9781111962159) this may not be the correct product. In some cases, you may also require a course code from your Instructor.Succeed in your course with Aplia's interactive learning system--featuring practice problems with immediate feedback and tools developed specifically for ECON FOR MICRO 2, 2nd Edition. Aplia has already helped more than a million students succeed in college classes.Instructor Assigned: Please be aware that the product you are purchasing is usable only if assigned by your instructor. If your instructor has not assigned this product, you should not continue with your purchase.