Elasticity of Demand CBSE Notes for Class 12 Micro Economics


You had planned to buy four pairs of jeans this year, but now you might decide to make do with two new pairs. A change in pencil prices, in contrast, might lead to very little reduction in quantity demanded simply because pencils are not likely to loom large in household budgets. The greater the importance of an item in household budgets, the greater the absolute value of the price elasticity of demand is likely to be. Understand the relationship between total revenue and price elasticity of demand.

  • A commodity for a person may be a necessity, a comfort or a luxury.
  • If this happens, producers who can’t foresee trouble ahead will produce larger quantities.
  • If the frequency of purchase is high then the demand tends to be inelastic.
  • If the proportion of income spent on goods decreases as income increases, then income elasticity for the goods is less by one.

This is because, when we deal with a range over which the price varies, it is always better to obtain a measure that reflects the average degree of consu­mer responsiveness. Thus, the amount desired for a commodity is affected not only by its own price, but also by the prices of other items. The Price Elasticity of Demand is a measure of the responsiveness of quantity sought when prices vary .

Calculation of Price Elasticity of Demand through the Midpoint Method

For example, most people own a car and need it to get to-and-from work each day. However, some people who can barely afford food or housing might consider a car a luxury. In a short interval of time the consumptions habits, traditions, customs do not change significantly. In this case, a huge change in price leads to a less than proportional change in demand. In this case, for the small change in the price of a commodity leads to a proportional change in the quantity demanded. For example, the demand for petrol for a car owner is inelastic.

In other words, with the fall in price, total expenditure decreases or with a rise in price, total expenditure increases. Total expenditure method indicates the direction in which total expenditure on a product changes as a result of change in price of the commodity. Hence by convention minus sign before the value of price elasticity of demand is generally ignored in economics. The degree of responsiveness of demand to change in the price of related goods is known as cross elasticity of demand.

elasticity of demand for comfort goods are

In economics, elasticity refers to a ratio of the relative changes in two quantities. It measures responsiveness or sensitiveness of one variable due to the change in another variable. Price elasticity of demand is always related to a period of time. It can be a day, a week, a month, a year or a period of several years.

The price elasticity of demand tends to be higher if it is a luxury good. The midpoint method is a commonly used technique to calculate the percent change of price. The primary difference is that it calculates the percentage change of quantity demanded and the price change relative to their average. It is quantitative statement, i.e., it tells us the magnitude of the change in quantity demanded as a result of change in price. The numerical value of the co-efficient of in­come elasticity may be zero, positive, or negative. There may be a particular commodity like salt the quantity demanded of which may not respond to a small change in the income of the buyers.

Using Knowledge of Elasticity

In this, the elasticity of demand is measured with the help of total expenditure incurred by customer on purchase of a commodity. The demand curve for every producer will be perfectly elastic because if any producer increases his price by the smallest amount, his demand will disappear. The price of a cup of coffee increases by $0.20, consumers might decide to instead buy tea of coffee. Coffee is an elastic product because a small increase in the price dropped the quantity demanded. Perfectly elastic demand is a rare occurrence where the quantity that is demanded change infinitely when there is a little change in the price of the product.

More expensive goods also tend to be more elastic since consumers are more sensitive to purchases that take up larger proportions of their income. Elasticity of demand measures the responsiveness of demand to a change in some other factor in the market. For example, if the price of a product changes, the price elasticity of demand tells you how much demand will change in response to that price change. One factor that can affect demand elasticity of a good or service is its price level. For example, the change in the price level for a luxury car can cause a substantial change in the quantity demanded. If, for example, a luxury car maker has an inventory surplus of cars, the company might reduce their prices to increase demand.

Next is negative income elasticity that shows that an increase in the incomes of consumers will lead to the decrease in the quantity that is demanded of such goods. Last is positive income elasticity that means an increase in the incomes of consumers will lead to the increase in quantity that is demanded of such goods. The demand curve for a perfectly inelastic demand is a vertical line i.e. the slope of the curve is zero. However, perfectly elastic demand is a total theoretical concept and doesn’t find a real application, unless the market is perfectly competitive and the product is homogenous. When there is a sharp rise or fall due to a change in the price of the commodity, it is said to be perfectly elastic demand.

elasticity of demand for comfort goods are

The income effect also tells us that demand for inferior goods will decrease as income increases and increases as income decreases. Using the income effect and the income elasticity of demand, you can determine whether a good is a normal or inferior good. The elasticity of demand measures the relative change in the total amount of goods or services that are demanded by the market or by an individual.

Determinants of the Price Elasticity of Demand

If the commodity under consideration has several uses, then its demand will be elastic. When price of such a commodity increases, then it is generally put to only more urgent uses and, as a result, its demand falls. When the prices fall, then it is used for satisfying even less urgent needs and demand rises. Commodities like biscuits, soft drinks, etc. whose demand is not urgent, have highly elastic demand as their consumption can be postponed in case of an increase in their prices.

elasticity of demand for comfort goods are

Based on the numeric values of elasticity quotient for price or coefficient of price elasticity, the price elasticity is classified into three types. In practice, there is no product that has a unitary elasticity of demand. When the quantity demanded changes the same rate as the price, then the demand is called unitary demand or unit demand. In economics, when we talk aboutelasticity,we’re referring to how much something will stretch or change in response to another variable.

Examples of Goods with a Price Inelastic Demand

There are several factors that affect the quantity demanded for a product such as the income levels of people, price of the product, price of other products in the segment, and various others. From the managerial point of view, it is thought useful to explain industry elasticity. We know from the law of demand that when the price of a commodity falls, the quantity demanded increases and vice versa. The relation of price to sales is known in economics as the demand. The concept of income elasticity can be used in forecasting future demand provided the firm knows the growth rate of income and income elasticity of demand for the good. It is often believed that the demand for goods and services increases with the rise in GNP that depends on the marginal propensity to consume.

If the price were lowered by $0.10 to $0.70, quantity demanded would increase to 60,000 rides and total revenue would increase to $42,000 ($0.70 times 60,000). So it appears that the impact of a price change on total revenue depends on the initial price and, by implication, the original elasticity. Do not confuse price inelastic demand and https://1investing.in/ perfectly inelastic demand. Perfectly inelastic demand means that the change in quantity is zero for any percentage change in price; the demand curve in this case is vertical. Price inelastic demand means only that the percentage change in quantity is less than the percentage change in price, not that the change in quantity is zero.

The country of Israel and the city of San Francisco installed cameras at several intersections. Drivers who ignored stoplights got their pictures taken and elasticity of demand for comfort goods are automatically received citations imposing the new higher fines. We can further classify these elastic and inelastic types of demand into five categories.

With price inelastic demand, the demand curve itself is still downward sloping. In our first example, an increase in price increased total revenue. Is there a way to predict how a price change will affect total revenue? When the price of a good or service changes, the quantity demanded changes in the opposite direction. Total revenue will move in the direction of the variable that changes by the larger percentage. If the variables move by the same percentage, total revenue stays the same.

The study also points out the effectiveness of cameras as an enforcement technique. With cameras, violators can be certain they will be cited if they ignore a red light. And reducing the number of people running red lights clearly saves lives. The economists estimated elasticities for particular groups of people. For example, young people (age 17–30) had an elasticity of −0.36; people over the age of 30 had an elasticity of −0.16.

Examples of Goods with a Price Elastic Demand

If demand is ELASTIC for the product, the managers can fix a lower price in order to expand the volume of sales and vice versa. On the other hand if a commodity has limited uses will have inelastic demand. The point elasticity method, we measure elasticity at a given point on a demand curve. The figure shows that, whatever the price, quantity demanded of the commodity remains unchanged at OQ.

The cross price elasticity of demand ranges from negative infinity to infinity and can also be divided into five zones of elasticity. The zones of elasticity can help you determine whether the two goods being compared are complements or substitutes. The measured value of elasticity is sometimes called the elasticity coefficient. When measured, the price elasticity of demand will have an elasticity coefficient greater than or equal to 0 and can be divided into five zones depending on the value of the coefficient.

The industry demand has elasticity due to competition from other industries. This shows that over the range the Engel curve E3 is negatively sloped. But before it bends backward, the Engel curve E3 illustrates the case of a necessary good having income inelasticity over much of its range.

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