I will try one last time. Say you have a craving for something, but you want the best. You go to the place where you want to buy it from, but find out that the price has been raised by a lot. At this stage you either walk away, or you want it bad enough that you cannot walk away because you will not find it anywhere else. So you end up paying and taking home that expensive thing you just bought. Now this is when the problem starts, the store owners next to the shop you went to saw' or heard the price that you paid for that item and want into that action. They don't have the exact same quality of the item that you purchased, but they think that they can increase the price of their product and see if anyone bites.
Next time someone who has a similar craving as you goes to the stores to purchase that product, he cannot find the same thing, but something similar is being sold in the store next to it, but when he pops into that store, he finds that the store owner is asking for a lot more than what he was selling for a month ago. He is in the same dilemma as you, either walk away, or end up paying the asking price. Now, he has the same craving as you, and has the money to pay for it, so he ends up paying the asking price and taking it home.
So.......who is responsible for that price increase? The buyer because he paid what was being asked? The seller because he increased his price because he think that's what it is worth? Or both because they helped increase the price of that product for everyone else?