Supply chain constraints. These external issues are often neglected when considering the impacts of using larger containerships since they concern beneficial cargo owners not involved in transport operations, but in supply chain management. The coordination of supply chains can be impacted in a significant manner, since a lower frequency of port calls imply the necessity to hold higher inventory levels, both in warehouses and in transit. For instance, an importer facing decreasing port of call frequency, would be forced to maintain a higher inventory level in its distribution centers to maintain a similar average lead time and meet the expectations of its customers. More cargo being carried on a single ship also represents a greater risk for partial loss or damage, particularly near ports, involving higher insurance premiums. Still, the risk factors of mega containerships remain to be better assessed by the insurance industry.