Marine transport advisors, McQuilling Services, give an insight into how they forecast the development of tanker demand, which is a constituent part of their recently published '2014-2018 Tanker Market Outlook' report. At a global level, marine transportation demand is related to world trade, which is directly related to the state of the world economy. This means that demand for crude oil and petroleum products grows with an expanding global economy. Marine transportation demand for tankers is a derived demand. It arises from the energy consumption requirements of regional economies.