In industries where a lot of competitors are selling the same product - mangoes, gasoline, DVD players - price is the easiest way to distinguish yourself. The hope is that if you cut prices enough you can increase your market share, and even your profits. But this works only if your competitors won't, or can't, follow suit.

Now, modern economies have a very effective mechanism for deciding if salaries are really too high: it's called the free market. That's how most people's salaries are set, after all, including those of major-league baseball players and European soccer players.

Most of the work on multitasking suggests that it generally makes you less efficient, not more.

Unlike most government programs, Social Security and, in part, Medicare are funded by payroll taxes dedicated specifically to them. Some of the tax revenue pays for current benefits; anything that's left over goes into trust funds for the future. The programs were designed this way for political reasons.

The fundamental problem with banks is what it's always been: they're in the business of banking, and banking, whether plain vanilla or incredibly sophisticated, is inherently risky.

I started in business journalism from the outside, so when I started writing about markets and business, I was struck by the fact that markets seemed to work well even though people are often irrational, lack good information and are not perfect in the way they think about decisions.

The financial crisis of 2008 was not caused by investment banks betting against the housing market in 2007. It was caused by the fact that too few investors - including all of the big investment banks - bet too heavily on the housing market in the years before 2007.