Weekly Video: Beware of the Expensive-Gym-Membership Effect.

For those of you following the 2010 Happiness Project Challenge, to make 2010 a happier year – or even if you haven't officially joined the challenge – this month's focus is Money. The relationship between money and happiness is one of the most complicated and emotionally charged subjects within the larger issue of happiness. I really can't do justice to its complexities in such a short video. (For a more nuanced discussion, read Chapter Seven in the book!)

Last week's resolution was to Buy...