OpenStax College2017-05-092017-05-092015-06-15http://hdl.handle.net/10790/3104If you use this textbook as a bibliographic reference, then you should cite it as follows: OpenStax College, Principles ofMacroeconomics. OpenStax College. 19 March 2014. <http://cnx.org/content/col11626/latest>.Creative Commons AttributionTextbook