I'm so not going over this again! There are some very simple things we should all be able to agree on, and if we say them without using the word "demand" then we can move on:
1. if the price of oil drops, people will buy more oil, and people will have no financial incentive to reduce their use/wastage of energy, or to use substitutes
2. if the price of oil rises, people will try to buy less oil, by either reducing their use/wastage of energy, or by using substitutes
3. In the absence of any other reason for adopting oil substitutes, people will only adopt substitutes when they are cheaper than oil
4. If oil supply falls, then people unwilling (or unable) to reduce their use/wastage of energy, or to use oil substitutes, will be prepared to pay more to secure supplies of oil, and the price will rise
A higher price of oil is therefore a market driver for reduction of use/wastage of energy, and a market driver for the market entry of substitutes. A lower price gives no financial incentive to reduce use/wastage, and may keep oil substitutes out of the market. Peak oil, which entails first a plateau in oil production and then a fall, despite rising global energy use, will drive prices higher, and therefore the creation and adoption of substitutes.



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in some of the data sets?????????