Principles of Microeconomics
Openstax College offers a free open textbook for the Principles of Micro-economics. This textbook 'covers the scope and sequence for a one-semester economics course. The text also includes many current examples, including; the Keystone Pipeline, Occupy Wall Street, and debates over the minimum wage.
The pedagogical choices, chapter arrangements, and learning objective fulfillment were developed and vetted with feedback from educators dedicated to the project. The outcome is a balanced approach to economics and to the theory and application of economics concepts. Current events are treated in a politically-balanced way, as well.'