WAR AND MARKET

"From the start of WWII in 1939 until it ended in late 1945, the Dow was up a total of 50%, more than 7% per year. So, during two of the worst wars in modern history, the U.S. stock market was up a combined 115%," Ben Carlson, Director of Institutional Asset Management at Ritholtz Wealth Management, in an article about counterintuitive market outcomes. "The relationship between geopolitical crises and market outcomes isn't as simple as it seems."

History tells us periods of uncertainty like we're seeing now are usually when stocks suffer the most. In 2011, researchers at the Swiss Finance Institute looked at U.S. military conflicts after World War II and found that in cases when there is a pre-war phase, an increase in the war likelihood tends to decrease stock prices, but the ultimate outbreak of a war increases them. However, in cases when a war starts as a surprise, the outbreak of a war decreases stock prices. They called this phenomena "the war puzzle" and said there is no clear explanation why stocks increase significantly once war breaks out after a prelude. 

Similarly, Mark Armbruster, the president of Armbruster Capital Management, studied the period from 1926 through July 2013 and found that stock market volatility was actually lower during periods of war. "Intuitively, one would expect the uncertainty of the geopolitical environment to spill over into the stock market. However, that has not been the case, except during the Gulf War when volatility was roughly in line with the historical average," he said.

"Part of the reason for the calm may lie in the changing structure of global oil markets and how the U.S. economy has become less vulnerable to energy price swings," said JPMorgan Funds chief global strategist David Kelly in a note. "Part of the reason may be purely psychological. Today’s investors have seen the stock market recover from both 9/11 and the Great Financial Crisis, arguably the greatest geopolitical and economic shocks of our time. This makes it easier for investors to shrug off other events."

"Over the last few years, markets have been conditioned not to overreact to political and geopolitical shocks for two reasons: first, the belief that there would be no significant subsequent intensification of the initial shock; and second, that central banks stood ready and able to repress financial volatility," said Mohamed Aly El-Erian, the chief economic adviser at Allianz, in a Bloomberg column.