Shadow fleets, groups of tanker ships used by sanctioned nations like Iran and Russia to move oil, comprise an estimated 17% of all international tankers, according to an Allianz report.
Despite fears about how oil shipments could be affected if Iran targets tanker traffic moving through the Strait of Hormuz, global supply remains strong.
With the Taliban in control, the business picture there could look foggy to the rest of the world, especially when it comes to how much money the government will actually have.