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.
New York is the USA's largest port, trade centre and the finance centre of the world. [From geoexplorer.co.uk 2002 article, no longer online] The Port of Houston is America's largest port in foreign tonnage, and the sixth-largest port in the world.