Welker, J. (2012, August 13). 1.0 introduction to economics [Video file]. Retrieved from https://www.youtube.com/watch?v=_PKH2wtDT3E&list=PL72F6BDC91310C0DA

Welker, J. (2012, August 25). 1.1 competitive markets, demand and supply [Video file]. Retrieved from https://www.youtube.com/watch?v=KGCNeKhLxio&list=PLE397E0B390D153D1

Welker, J. (2011, October 18). 1.2 elasticities [Video file]. Retrieved from https://www.youtube.com/watch?v=GEAO095gP6M&list=PLBEC96A2BF53D0E0D

Welker, J. (2011, November 6). 1.3 government intervention [Video file]. Retrieved from https://www.youtube.com/watch?v=QbdFe3Cku3Y&list=PLAD42514E3391CDA7

Welker, J. (2011, November 18). 1.4 market failure [Video file]. Retrieved from https://www.youtube.com/watch?v=7pyB-sTCB8U&list=PLE7312C13EE8D984F

Welker, J. (2012, January 29). 1.5 theory of the firm [Video file]. Retrieved from https://www.youtube.com/watch?v=CfioxJ4E_h4&list=PL1B03A3CAE87226BB

tutor2u. (2016, April 14). A Level Economics - Microeconomics [Video file]. Retrieved from https://www.youtube.com/watch?v=7HG2yGcRHho&list=PLp8BSCLLWBUA0G6ifwqq4Z8McaF8eyWfX

Holden, P. (2013, September 11). Economics Paj Holden [Video file]. Retrieved from https://www.youtube.com/watch?v=C6Y8u1GNysE&list=PLafJJJQm-fnljq7D2yuvUkxbKy-E7rKVZ