Perfect Competition:
What is Perfect Competition? -- study.com (need to sign up for this website)
Perfect Competition -- Khan Academy
What is Perfect Competition -- mjmfoodie
Intro to Perfect Competition -- ACDC Econ
4 market structures & Perfect Competition -- ACDC Economics
maximizing profit -- ACDC Econ
LR vs. SR -- ACDC Econ
Practice graphing... -- ACDC Econ
Why is Perfect Competition efficient? -- WelkerWikinomics
Monopoly:
Monopoly Basics -- Khan Academy => lots of good info here!
What is a monopoly? -- study.com => ultimately, you'll have to pay to use this site, but there is a free trial
Monopoly -- economicshelp.com
Monopoly -- economicsfun
Imperfect Competition -- ACDC Econ
Monopoly -- ACDC Econ
Graphing a Monopoly -- ACDC Econ
More Graphing a Monopoly -- ACDC Econ
Monopoly and DWL -- ACDC Econ
Elasticity and Monopoly -- ACDC Econ
Regulating a Monopoly -- ACDC Econ
Subsidies for a Monopoly -- ACDC Econ
Monopoly Review -- ACDC Econ
Oligopoly:
Oligopoly and Game Theory -- ACDC Econ
Dominant Strategy practice -- ACDC Econ
Prisoners' Dilemma and Nash Equilibrium -- Khan Academy
Game Theory movie clips: A Beautiful Mind and The Princess Bride; The Dark Knight (ACDC Econ); The Good, The Bad & The Ugly
Monopolistic Competition:
Monop. Competition -- ACDC
Monop. Competition -- Welkernomics
Monop. Competition -- mjmfoodie