The Berlin Wall wasn't the only barrier to fall after the collapse of the Soviet Union and the end of the Cold War. Traditional barriers to the flow of money, trade, people and ideas also fell.
But as the arms-control scholar Thomas Schelling once noted, two things are very expensive in international life: promises when they succeed and threats when they fail.
In a world awash in debt, power shifts to creditors.
It's not possible for two countries to be the leading dominant political power at the same time.
It is absolutely clear that government plays a key role, as a catalyst, in promoting long-run growth.
I very much want to be in the business of creating content, of doing stories all over the world rather than figuring out what the business model is for 'Newsweek' on the iPad, although that's very important work as well.
The great drama of Russian history has been between its state and society. Put simply, Russia has always had too much state and not enough society.
Strip away the usual hot air, and bin Laden's audiotape is the sign of a seriously weakened man.
What we see today is an American economy that has boomed because of policies and developments of the 1950s and '60s: the interstate-highway system, massive funding for science and technology, a public-education system that was the envy of the world and generous immigration policies.
America washes its dirty linen in public. When scandals such as this one hit, they do sully America's image in the world. But what usually also gets broadcast around the world is the vivid reality that the United States forces accountability and punishes wrongdoing, even at the highest levels.
I am an American, not by accident of birth but by choice. I voted with my feet and became an American because I love this country and think it is exceptional.
America's growth historically has been fueled mostly by investment, education, productivity, innovation and immigration. The one thing that doesn't seem to have anything to do with America's growth rate is a brutal work schedule.
On almost every issue involving postwar Iraq, assumptions and policies have been wrong. This strange combination of arrogance and incompetence has not only destroyed the hopes for a new Iraq. It has had the much broader effect of turning the United States into an international outlaw.