The factoid thrown around is that roughly 20% of the world’s oil supply travels through the Strait of Hormuz. Since it closed, my local gas prices in one area of the US midwest have gone from $2.60 to now $4.10 presumably as reserves have been used up.
I could understand a 20~30% increase in price to correlate with the reduction in supply, but what are the economic factors that lead to what feels like such a disproportionate increase?


Completely agree, actually.
This isn’t what I think someone should do. It is morally abhorrent. This is just a contrived scenario to try and prime an intuition to help OP understand why small changes in supply can have outsized effects on price.
If at any point someone sees human suffering or danger and thinks “profit opportunity”, I have a hard time understanding why that person should be permitted to continue to participating in society freely.