Market concentration of vessel operators

Market concentration of vessel operators#

Market concentration among vessel operators in Pacific Island countries can be analyzed using the Herfindahl-Hirschman Index (HHI):

\[HHI = \sum s_i^2\]

Where \(s_i\) is the market share of operator \(i\). HHI value close to 0 indicates near perfect competition, while HHI value close to 1 indicates monopoly.

Here, the market share is defined by the share of port calls from an operator. We use the port calls data derived from AIS, and the operator information from ship register data. Note that this excludes all vessels not registered with the IMO which is ~12% of port calls from cargo, tanker, and passenger vessels.

The following interactive graph displays yearly HHI values for each country by vessel category. To use this graph:

  1. Compare two years: Select different years in both fields to see how market concentration changed between them.

  2. View a single year: Select the same year in both fields to see a snapshot of that year’s data.

  3. Change vessel category: Use the category selector to view HHI values for different vessel types.

Note: Countries are sorted according to the latest year selected.