Which of the pairs of goods would you expect to have a...

Which of the pairs of goods would you expect to have a greater price elasticity of demand?
a. Cars, transportation.
b. Housing, leisure travel.
c. Rubber during World War II, rubber during the entire 20th century.

Key Concepts

Substitute Goods and Necessities versus Luxuries

Goods that have close substitutes tend to have more elastic demand because consumers can easily switch to alternatives if the price rises. In contrast, necessities, such as basic transportation or housing, often have inelastic demand as consumers must continue to purchase them regardless of changes in price. In the context of the question, distinguishing between necessities and luxury or leisure items helps explain differences in price elasticity between goods.

Price Elasticity of Demand

This concept refers to the responsiveness of the quantity demanded of a good to a change in its price. It measures the percentage change in quantity demanded in response to a one percent change in price, and is influenced by factors such as the availability of substitutes, the proportion of income spent on the good, and whether the good is considered a necessity or luxury.

Time Horizon in Elasticity

The time period under consideration affects price elasticity of demand. In the short run, consumers may find it difficult to change their consumption habits, leading to inelastic demand, while over a longer period, consumers are more able to adjust their behavior, which can result in more elastic demand. This is relevant when comparing elasticity of goods like rubber during specific historical periods versus over long stretches of time.

Transcript

00:01 Now, this question has to do with determinants of the elasticity of demand.

00:11 Now, first we have substitutability.

00:18 Generally, the larger the number of substitute goods that are available, the greater the price elasticity of demand.

00:25 Next, we have proportion of income.

00:34 Other things equal, the higher the price of a good relative to consumers ' incomes, the greater the price elasticity of demand.

00:41 Next, we have luxury versus necessity.

00:49 In general, the more that a good is considered to be a luxury rather than necessity, the greater is the price elasticity of demand.

00:59 And finally, time.

01:02 Again, generally, a product demand is more elastic the longer the time period under consideration.

01:07 So now these are not rules, but rather generalities and general determinants.

01:13 So now, if we look at the options offered in the question, we have first bottled water.

01:19 Looking at these options, bottled water, it's probably more of an elastic good.

01:29 And this has to do with the fact that it has a lot of substitutability.

01:34 Tap water or personal filtered water can be used as a replacement for bottled water, meaning that consumers will probably be pretty reactive to a price change in bottled water.

01:46 Next, we have toothpaste...

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