Behavioural economists tell us that humans aren't rational and thus that carefully crafted regulation can be better than laissez faire. Possibly so, but then public choice economics tells us that "carefully crafted" ain't what regulation ever is. The idea  is thus rather better than the reality.
How addicted  do drug users get? Not very according to the latest figures: even with crystal meth only 5% of users actually become addicts.
Ripples of the credit crunch  or how you can now buy (certain) airline tickets with PayPal.
On airlines , those limits upon liquids or gels in baggage: are these by volume or weight?
Greenhouse gas  efficiency is indeed increasing.
A very efficient  (if rare) method of making money.
And finally , how modern political reporting would have covered one of the great political debates of the past.