Cross-price elasticities tend to be negative when two goods are complements. e.g Printers and Computers. ↑ P computers makes people demand less printers. The "law of demand," namely that the higher the price of a good, the less consumers will download, has been termed the "most famous law in economics, and the. Define elasticity of demand and differentiate between elastic and inelastic elasticity price elasticity of demand price-inelastic demand price-elastic demand.

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What is elasticity? What kinds of issues can elasticity help us understand? • What is the price elasticity of demand? How is it related to the demand curve?. Demand is ELASTIC. – when the price elasticity (ignoring the negative sign) is greater than – i.e. when the % change in quantity demanded exceeds the. Price elasticity of demand. A measure of the extent to which the quantity demanded of a good changes when the price of the good changes. To determine the.

This type of analysis would make elasticity subject to direction which adds unnecessary complication. To avoid this, we will instead rely on averages. Mid-point Method To calculate elasticity, instead of using simple percentage changes in quantity and price, economists use the average percent change. This is called the mid-point method for elasticity, and is represented in the following equations: The advantage of the mid-point method is that one obtains the same elasticity between two price points whether there is a price increase or decrease. This is because the denominator is an average rather than the old value. Using the mid-point method to calculate the elasticity between Point A and Point B: This method gives us a sort of average elasticity of demand over two points on our curve.

As we will see in Topic 4. To calculate this, we have to derive a new equation. This gives us our point-slope formula. This analysis gives us elasticity as a single point. This is not a coincidence. When we are calculating from Point A to Point B, we are actually just calculating the elasticity at Point A, since we are using the values on Point A as the denominator for our percentage change.

When we use the mid-point method, we are just taking an average of the two points. This solidifies the fact that there is a different elasticity at every point on our line, a concept that will be important when we discuss revenue. Even though mid-point and Point-Slope appear to be fairly different formulas, mid-point can be rewritten to show how similar the two really are. Notice that compared to point-slope: This reinforces the conclusion that mid-point represents an average.

This means it can be applied to more that just the price-quantity relationship of our market model.

We will examine this even further when we introduce consumer theory, but for now we can develop our understanding by applying what we know about elasticities. Our analysis of elasticity has been centred around demand, but the same principles apply to the supply curve. The more elastic a firm, the more it can increase production when prices are rising, and decrease its production when prices are falling. Our equation is as follows:. Own-price elasticity of supply can be calculated using mid-point and point-slope formula in the same way as for e P D.

Whereas before we could ignore positives and negatives with elasticities, with cross-price, this matters. Consider our discussion of complements and substitutes in Topic 3. If the price of a complement rises our demand will fall, if the price of a substitute rises our demand will rise.

For cross-price elasticity this means:. Now we can comment on the strength of the relationship between two goods. For example, a cross-price elasticity of -4 suggests an individual strongly prefers to consume two goods together, compared to a cross-price elasticity of This could represent the cross-price elasticity of a consumer for a hot dog, with respect to ketchup and relish.

The consumer might strongly prefer to consume hot dogs with ketchup, and loosely prefers relish. In Topic 3 we also explained how goods can be normal or inferior depending on how a consumer responds to a change in income.

This responsiveness can also be measured with elasticity by the income elasticity of demand. The value of our elasticity will indicate how responsive a good is to a change in income. A good with an income elasticity of 0. Elasticity is a measure of responsiveness, calculated by the percentage change in one variable divided by the percentage change in another.

Both mid-point and point-slope formulas are important for calculating elasticity in different situations. Mid-point gives an average of elasticities between two points, whereas point-slope gives the elasticity at a certain point. These can be calculated with the following formulas:. Use the mid-point formula in your calculation.

Own-price elasticity of demand is equal to:. If own-price elasticity of demand equals 0. Suppose you are told that the own-price elasticity of supply equal 0.

Which of the following is the correct interpretation of this number? Suppose that a 10 increase in price results in a 50 percent decrease in quantity demanded. What does the absolute value of own price elasticity of demand equal? If pizza is a normal good, then which of the following could be the value of income elasticity of demand? Skip to content Increase Font Size.

Spare capacity: it is easy to increase production if there is a shift in demand. Ease of switching: if production of goods can be varied, supply is more elastic.

Ease of storage: when goods can be stored easily, the elastic response increases demand. Length of production period: quick production responds to a price increase easier. Time period of training: when a firm invests in capital the supply is more elastic in its response to price increases. Factor mobility: when moving resources into the industry is easier, the supply curve in more elastic.

Reaction of costs: if costs rise slowly it will stimulate an increase in quantity supplied. If cost rise rapidly the stimulus to production will be choked off quickly.

The result of calculating the elasticity of the supply and demand of a product according to price changes illustrates consumer preferences and needs.

Price elasticity over time: This graph illustrates how the supply and demand of a product are measured over time to show the price elasticity.

Perfectly Inelastic Supply: A graphical representation of perfectly inelastic supply. Measuring the Price Elasticity of Supply The price elasticity of supply is the measure of the responsiveness of the quantity supplied of a particular good to a change in price. When calculating the price elasticity of supply, economists determine whether the quantity supplied of a good is elastic or inelastic. Key Terms mobility: The ability for economic factors to move between actors or conditions.

The intent of determining the price elasticity of supply is to show how a change in price impacts the amount of a good that is supplied to consumers. The price elasticity of supply is directly related to consumer demand. Elasticity The elasticity of a good provides a measure of how sensitive one variable is to changes in another variable.

In this case, the price elasticity of supply determines how sensitive the quantity supplied is to the price of the good. Calculating the PES When calculating the price elasticity of supply, economists determine whether the quantity supplied of a good is elastic or inelastic. The percentage of change in supply is divided by the percentage of change in price. There is no change in quantity if prices change.

An decrease in prices will lead to zero units produced. Factors that Influence the PES There are numerous factors that impact the price elasticity of supply including the number of producers, spare capacity, ease of switching, ease of storage, length of production period, time period of training, factor mobility, and how costs react.

The price elasticity of supply is calculated and can be graphed on a demand curve to illustrate the relationship between the supply and price of the good. Supply and Demand Curves: A demand curve is used to graph the impact that a change in price has on the supply and demand of a good.

Applications of Elasticities In economics, elasticity refers to how the supply and demand of a product changes in relation to a change in the price. For elastic demand, a change in price significantly impacts the supply and demand of the product. For inelastic demand, a change in the price does not substantially impact the supply and demand of the product.

Economists use demand curves in order to document and study elasticity. Key Terms elastic: Sensitive to changes in price. In economics, elasticity refers to the responsiveness of the demand or supply of a product when the price changes. The technical definition of elasticity is the proportionate change in one variable over the proportionate change in another variable.

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