Trump threatened new tolls in the Strait of Hormuz. What if other countries follow suit?

U.S. President Donald Trump threatened to impose new tolls in the Strait of Hormuz last weekend, sparking worries that the practice of charging to pass through critical waterways could spread - with devastating consequences to the global economy. Iran has blocked the strait for much of the war, reportedly charging tolls as high as $2 million US for ships it allows to pass.