Explain the Immediate Economic Effects of the Highlighted Characteristics

So, it says “Highlight the information in the text that has the greatest economic effects. Explain the immediate economic effects of the highlighted characteristics.” Basically cause and affect.

Here’s the cause: “The tropical seas surrounding the peninsula isolate it from its neighbors and are vital to its economy. The Red Sea allows ship passage between Europe and Asia, and the Persian Gulf provides passage for oil-producing countries to ship oil to the rest of the world.”

Now, what would be the effect?