Loading the player... Covariance is a measure of the degree to which returns on two risky assets move in tandem. A positive covariance means that asset returns move together, while a negative covariance means returns move inversely.
1. Rotterdam (the Netherlands) This Dutch harbor was the largest in the world, until Shanghai and Singapore grew even larger in 1986. This satellite photo gives an indication of the size of the Port of Rotterdam. (Image via Mannlines) About an hour and a half to the south of Rotterdam is Antwerp, the largest port in Belgium.
The largest airport in the world in terms of square footage is the King Fahd International Airport in Damman, Saudi Arabia. It covers 485 square miles! In terms of number of passengers, Hartsfield-Jackson International Airport in Atlanta, Georgia is the largest/busiest in the world. It served 92 million passengers in 2011 alone.