Who do peak oil cause the price oil to increase???

i want to know how do they process the oil when there is a peak oil and it must got to relate to the reason why this stages of oil produced could increase the oil price in the market. I know it is because of the process and the technology using at this time, but i need to know in very detail. i think wikipedia is not helping.Who do peak oil cause the price oil to increase???
';Peak Oil'; is a concept when output is maxed. In other words, ';after'; peak oil, output still continues, but declines. That means supply goes down and price goes up.Who do peak oil cause the price oil to increase???
no matter what price of oil is, you can only make a certain amount of petrol from of a barrel of oil. So if oil price increases, and you want to earn same profits, you have to increase price of petrol.
Peak oil is a theory relating to the idea that the oil will run out soon... That's it...

jane iredale