valhalla360 wrote:
The result is diesel prices tend to be inelastic. That means they tend to be slower to go up and down.
That's not what elasticity is. It has nothing to do with any stickiness or lag in price adjustments. It has to do with the demand for a good through a range of prices.
"Price elasticity" means that the change in price has little affect on the shape of the demand curve.
You're kind of in the ballpark in that fuel tends to be price inelastic compared to other goods, but not because of a time lag.
Elasticity boils down to how much you really need something. My demand for ice cream would be pretty flat from $0 to $6 per carton, but then at $7/carton my demand would taper off and I'd either look for substitute goods or just do without.
My demand curve for oxygen is perfectly flat. I always want the same amount. Thank God it's free, but if you raised the price I'd still want the same quantity. My demand for oxygen is perfectly inelastic.
Our demand for fuel is relatively inelastic compared to things like ice cream. But "inelasticity" refers to the fact that our demand doesn't change a lot based on the price.
Elasticity has nothing to do with a lag in the prices based on supply.
(And there are tons of other things that impact the shape of a demand curve besides the price of the good, like price and availability of substitute goods.)