Economic efficiency

Thanks to tutor2u for this summary
http://www.tutor2u.net/economics/reference/economic-efficiency-revision-presentation?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Fri%2015th%20January%202016&utm_content=Economics%20daily%20digest%20Fri%2015th%20January%202016+CID_8f1c652e085ba9e45eb9bbf2fc87fc27&utm_source=CampMonitor&utm_term=Economic%20Efficiency%20Study%20presentations%20This%20is%20an%20updated%20revision%20presentation%20on%20economic%20efficiency%20in%20markets