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If demand is unitary elastic, the quantity falls by exactly the percentage that the price rises. Two important special cases are perfectly elastic demand (= ∞), where even a small rise in price reduces the quantity demanded to zero; and perfectly inelastic demand (= 0), where a rise in price leaves the quantity unchanged.
Perfectly inelastic demand is represented by a vertical demand curve. Under perfect price inelasticity of demand, the price has no effect on the quantity demanded. The demand for the good remains the same regardless of how low or high the price. Goods with (nearly) perfectly inelastic demand are typically goods with no substitutes.
When the demand curve is perfectly inelastic (vertical demand curve), all taxes are borne by the consumer. When the demand curve is perfectly elastic (horizontal demand curve), all taxes are borne by the supplier. If the demand curve is more elastic, the supplier bears a larger share of the cost increase or tax. [16]
If price elasticity of demand is calculated to be less than 1, the good is said to be inelastic. An inelastic good will respond less than proportionally to a change in price; for example, a price increase of 40% that results in a decrease in demand of 10%. Goods that are inelastic often have at least one of the following characteristics:
If the demand decreases, then the opposite happens: a shift of the curve to the left. If the demand starts at D 2, and decreases to D 1, the equilibrium price will decrease, and the equilibrium quantity will also decrease. The quantity supplied at each price is the same as before the demand shift, reflecting the fact that the supply curve has ...
In economics, the total revenue test is a means for determining whether demand is elastic or inelastic. If an increase in price causes an increase in total revenue, then demand can be said to be inelastic, since the increase in price does not have a large impact on quantity demanded. If an increase in price causes a decrease in total revenue ...
The deadweight loss would be zero when either demand or supply is perfectly inelastic. The third graph in the page you mentioned is what happens when demand is inelastic. The white triangle of deadweight loss is small, and if the demand were completely inelastic (i.e. a vertical line,) it would be nonexistent.
In the real world, there are many determinants of demand other than price, such as the prices of other goods, the consumer's income, preferences etc. [5] There are also exceptions to the law of demand such as Giffen goods and perfectly inelastic goods.