We do not normally comment on domestic political affairs unless they affect international affairs. However, it is necessary to consider American political affairs because they are likely to have a particular effect on international relations.

In recent weeks, rumors that Russian Interior Minister Vladimir Kolokoltsev will be replaced have been circulating among Russian media and pundits who watch Moscow.

Since mid-June, the price of Brent crude oil has fallen by nearly 25 percent -- going from a high of $115 to about $87 a barrel -- and structural factors are causing concern among global oil producers that oil prices will remain near current levels through at least the end of 2015.

The stress tests are only the starting point in the much deeper and complex process of creating a banking union in Europe.

Over the past few weeks, I've had people at speaking engagements ask me if I thought the Islamic State or some other militant group is using Ebola as a biological weapon, or if such a group could do so in the future.Such questions and concerns are not surprising.

Germany's exports were equivalent to 51 percent of its gross domestic product, or $1.7 trillion, in 2013. China's exports equaled 23.8 percent of a larger GDP, or about $9.4 trillion.

Oil prices dropped steeply Oct. 14, with crude oil futures falling 4.6 percent to $81.84 per barrel -- the biggest decrease in more than two years.