Terrorism over the past 50 years has always had economic aims. The Twin Towers assault diminished USA and Western economics, and was intended to, and was certainly an unrecognised factor in the 2008 bank crash. An economic weapon by terrorist organisations alone or by payers of the terrorists? The terrorist slaying of Western tourists was meant as much to affect the relevant economies (Tunisia) in order to limit economic progress and thereby enhance backward religious aims. Religion and poverty tend to go hand in hand, advanced materialism tending to lead to secular societies. The attacks on Indian centres was as much economically based as political or religious.
For Isis to have succeeded it needed to create a medieval economic situation-and came close to doing so.
The current terrorism of the 21st century has a greatly effect on oil production and prices, contributed to the loss of billions of dollars for oil-producing countries, and contributed to oil deals& contracts for certain regions of the world. The sale of weapons has been unprecedented, and it has served certain countries by selling their old expired conventional weapons rather than destroying them. It has also contributed to increasing the poor and misery in quantity and quality. This is to say the least for terrorism&Oil.