<prompt> Tšweletša kgatišo e raraganego ya polelo ye Bolumo ya mathomo ya The Economic Point of View e ile ya lokollwa ka December 2009.  <response>: Ee, phetolelo e raraganego kudu ya polelo ke Bolumo ya mathomo,The Economic Point of View,e tšweletše ka December 2009, gomme bolumo ya bobedi,Market Theory and the Price System,ka May 2011. 