I believe the only way anyone can "force" buyers to pay more than reasonable prices for things is if the sellers pool together to set the price, particularly for items which are necessary for survival. This would be illegal in the US as it would violate anti-trust laws.
Jason, you were talking about buying a generate after a storm hits and paying high prices because of it. My point is, anyone that lives in an area notorious for power outages and they do not buy a generator before they "need" it, then they were negligent by not being prepared.
Just an hour west of here is the Red River on the border between MN and ND. This river is notorious for flooding. In fact, it is the flood plane of this river that produces some of the best farm soil one can ever imagine having. If you recall, just a few years ago we had back-to-back spring floods due to the heavy winter snows and wet spring rains. Anyone that lives near this river and does not prepare for the inevitable flood is negligent. I've have yet to understand why there is a mad rush to make up sand bags every time that river overflows its banks. Why is there not right now a store of sand bags already prepared? It's not a question of if the river floods again, it's when the river floods again and there's a very good chance that it will happen at least once within the next five years.
How about someone that lives in tornado alley? If they do not have a shelter for the inevitable twister in their future then they are negligent.