Unit 2: Alcohol consumption; Market failure through negative externalities

This BBC clip says that drunken violence is costing the NHS in Scotland millions of pounds every year, according to new figures.

< http://www.bbc.co.uk/mediaselector/check/player/nol/newsid_7140000/newsid_7148200?redirect=7148288.stm&news=1&bbram=1&bbwm=1&nbram=1&nbwm=1 >

a) Define negative externalities
b) Explain the negative externalities associated with excessive alcohol consumption shown in the clip