Readings for Students from last week's lecture

Some recent posts to complement last week's supply-and-demand sessions

1. The incredible Brad de Long on markets, consumer and producer surplus.
2. From Freakonomics a long and thoughtful piece on whether people really do respond to incentives
3. Supply and demand in the university market. 
4. Monetary estimates of externalities from the Department of Transport, para 46.  Thanks to Geoff Riley for the tip.