average

In marine insurance and shipping law, an average is a loss or damage that affects the cargo, ship, or both during a voyage. The term covers financial claims arising from incidents at sea: collisions, groundings, fire, heavy weather, or piracy. When goods arrive damaged or short, or when deliberate sacrifice occurs (such as jettisoning cargo to save the vessel), the resulting expense or loss is called an average. The shipowner or insurer must compensate the cargo owner, and the amount depends on how the loss is classified.

There are two main categories. A particular average is damage to specific cargo or part of the ship, paid by the party whose negligence caused it, or covered by their insurance. A general average is a loss caused by deliberate act to save the whole venture: throwing cargo overboard in a storm, or scuttling the ship to prevent total loss. In a general average, the loss is shared proportionally among all parties whose goods or vessel benefited from the sacrifice, even if they were not at fault. This principle dates back centuries and is governed by maritime law and insurance custom.

Calculation and adjustment

Average settlements are worked out by professionals called average adjusters, who examine bills of lading, insurance policies, invoices, and damage surveys. They determine the insurable value of each interest (cargo, hull, freight) and calculate each party's proportional contribution to the loss. Complex cases involving multiple shippers, ports of origin, and overlapping policies can take months to resolve. The process is adversarial: each claimant submits evidence, and the adjuster mediates disputes over whether a loss qualifies as general or particular average.

The term 'average' itself comes from Arabic awar, meaning damage, which entered European maritime trade through Italian merchants in medieval times. It has no connection to mathematical averages or typical values. In modern shipping, average disputes are increasingly covered by standard insurance policies that reference York-Antwerp Rules, a harmonized code of average practice adopted internationally. However, even with standard terms, claims remain contentious because the difference between particular and general average can shift thousands in liability between shipowner, insurer, and shipper.