Americans work more than Europeans, about 30% more. In the 1970s, this was not the case. What accounts for the difference? "It's women," states Finance Professor Indraneel Chakraborty of SMU Cox. Chakraborty says, "Women are making relatively larger contributions to the workforce and to GDP in the U.S."

On the surface, the typical investor may understand that holding crude oil exchange-traded funds (ETFs) shares is similar to investing in crude oil's gains and losses. But an underperformance story surrounds these ETFs, which Cox Finance Professor Kumar Venkataraman and co-authors de-mystify.