Demand

UC Berkeley
http://www.youtube.com/watch?v=ZR2255CEhvk

Deriving demand curves
http://ocw.mit.edu/courses/economics/14-01sc-principles-of-microeconomics-fall-2011/unit-2-consumer-theory/deriving-demand-curves/

Consumer choice
http://www.youtube.com/watch?v=VNhgKtOWx9U

Elasticity

MIT
http://ocw.mit.edu/courses/economics/14-01sc-principles-of-microeconomics-fall-2011/unit-1-supply-and-demand/elasticity/

Property rights in markets
http://www.ted.com/talks/rob_harmon_how_the_market_can_keep_streams_flowing.html

Watch this lecture by Professor Oriana Bandiera at the Royal Economics Society called “What Economists Really do”
www.res.org.uk/resources-page/what-economists-really-do-oriana-bandiera-annual-public-lecture-2018.html