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.
Asian Ports Are Among The Busiest. Container ships are unloaded at the Port of Singapore. The Port of Singapore is the world's busiest port in terms of total shipping tonnage moving through it, and second only to Shanghai in terms of total cargo tonnage moved.