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.
Port of Shanghai. The Port of Shanghai is the biggest port in the world based on cargo throughput. The Chinese port handled 744 million tonnes of cargo in 2012, including 32.5 million twenty-foot equivalent units (TEUs) of containers. The port is located at the mouth of the Yangtze River covering an area of 3,619kmÂ².