In which Adriene Hill and Jacob Clifford teach you about specialization and trade, and how countries decide whether they're going to make stuff or trade for stuff. You'll learn about things like comparative advantage, the production possibilities frontier and how to make pizza! Crash Course is now on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: Mark Brouwer, Jan Schmid, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall TO: Sarah M. FROM: Anthony M. "Making our own history awesome! Happy 3 year Anniversary!" TO: Everyone FROM: Someone "The earth is but one country, and mankind its citizens." Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever: Nathanial R. Castronovo, Eefje Savelkoul, Nupur Maheshwari, Jacob J., Dominik Steenken, Shai Belfer, Stefan Bjerring Henriksen James Kribs, Hugo Jobly, Tim Eramo Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com/ Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: null