It’s also important to remember that even at 2 bucks a gallon, gas is still damned cheap in constant dollars. And also compared to other commodities. I drive a vehicle that gets about 20 MPG. My job is 10 miles away. So I can drive to work and back for two bucks. That’s competitive with the bus, it’s 1/3 less than I pay to park the vehicle when I get to work. The 40 bucks a month I pay for gas to get myself to work and back is less than I pay for my cable TV. So in absolute terms, gas is still pretty cheap compared to the value it gives us.
This may be why the demand for gas is in the inelastic range - it’s just so cheap that it’s not a limiter of behaviour. Other factors limit the amount we drive and the type of vehicles we drive more so than the price of gas.
That will change as gas gets more expensive (and it will, eventually, even if it comes down again in the short and medium term). When gas is $4/gallon and it costs $100 to fill up a car, you’ll see some major changes in behaviour.
For example, at $2 per gallon, at an average driven of 15,000 miles per year, a car that gets 15 miles per gallon will burn up $2,000 a year in gas - less than $200 per month. Going to a tiny vehicle that gets 30mpg, only saves you $1,000 per year.
Now, think of all the people who could drive vehicles worth $10,000, like a Sunfire, but instead choose to buy a $40,000 SUV. For them, an extra $1,000 per year just isn’t a big factor in their choice - hence the long-term inelasticity of oil prices.
The same goes for hybrids. Hybrids typically cost maybe $4,000 more than a non-hybrid equivalent. And they require a battery overhaul every 5-10 years costing $5,000 or more. From a pure economic sense, spending all that extra money to save $1,000 a year in fuel just isn’t worth it (it’s getting close, though). So today, hybrids are purchased by people who put more value on them than just the cost of gas - environmentalists, technophiles, etc. Classic early adopters.
But make gas $4 per gallon, and suddenly there are major savings to be had. THe guy who drives a 40 mpg hybrid instead of a 15 mpg non-hybrid is going to save $2,500 per year. THAT is definitely worth it. So long before gas gets that high, you’re going to see a mass migration to hybrids and other high-fuel economy vehicles. That in turn will eventually drive their price down, and make them even more desirable. It’s called the ‘tipping point’. Gas will get there, and demand will stop being inelastic.
The big problem today, however, is not SUVs. It’s China. China is becoming a HUGE consumer of resources. Currently 55% of all the world’s concrete is being consumed by China. Their increase in energy consumption is going up by double digits a year. The rise of China, more than anything else, is going to put a real strain on our resource infrastructure.