Every time you have a carrot instead of a cookie, every time you go to the gym instead of going to the movies, that's a costly investment in your health. But how much you want to invest is going to depend on how much longer you expect to live in the future, even if you don't make those investments.

How much is an hour of your time worth? It's worth whatever wage you would get if you spent that hour working. If you work for an hourly rate, this is an easy calculation. Even if you work for a salary and a fixed number of hours, the principle is the same: It's whatever your salary works out to per hour.

The key to good decision making is evaluating the available information - the data - and combining it with your own estimates of pluses and minuses. As an economist, I do this every day.

Every time I go out onto a tennis court, I know what to expect.

Every time you make a guess of what a judge is going to do... you're wrong, so I try to stay away from that.

Dylan doesn't have to make Blonde On Blonde every time.