Added to this is the gradual trend toward concentration and monopolization in the global oil tanker market, which strengthens those sellers secure in the ownership of their own ships (specialized shipping companies or major international oil companies) and adds much difficulty to negotiations and agreements.
再加上國際油輪市場漸趨集中與壟斷化，使得擁船自重的賣方（專業船公司或國際大型石油公司）更加強勢，為談判、議約憑添不少困難。