ECON 1B03 Lecture 1: ECON 1B03- Week 5 Module 2

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If we are given percentage changes in price and the corresponding changes in qd, we use the formula. The price of milk increases by 2% and qd decreases by . 5% It measures the impact of a marginal change in price on quantity demanded. Ep = dq/dp * p/q: this is actually easy to compute, since dq/dp is just the slope of a linear demand curve when demand is in the form q = f(p). In all three examples, we have an elasticity coefficient that has a negative sign: but, remember the law of demand: as ph, qd i. The coefficient will always be a negative number: since we"re smart economists and know this, when we calculate price elasticity, we drop the negative sign (we know it will always be negative). If you spend a large proportion of your budget on a good, demand for that good will tend to be elastic.

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2. Income?Qd of Hamburger??Qd of Steak

Per month? per month?per month

Month 1?$750?8 lbs.?2 lbs.

Month 2?$950? 5 lbs.?4 lbs.

a. What is the income elasticity of demand for hamburgers?

b. What is the income elasticity of demand for steak?

c. From our study of demand in an earlier chapter, we know ___________is a normal good, whereas _______________is an inferior good.

3. Suppose the price of Butter Pecan Ice Cream has recently risen by 10% due to an increase in the cost of pecans used to make the ice cream. As a result, fewer Butter Pecan ice cream cones are being sold in the ice cream store where you work. You do some checking and find that Raspberry Chip ice cream cone sales are up 4%. What is the cross-price elasticity of Butter Pecan and Raspberry Chip ice cream cones? Are these two goods complements or substitutes?

12. If the price rises, the quantity supplied will be greater the

a. Longer the time that elapses.

b. More income elasticity is good.

c. Higher the price elasticity of demand for the good.

d. All of the above.

13. If the price elasticity of demand is -.5 and quantity demanded increases by 5%, the price must have

PROBLEM SET ONE -2 - PRICE-ELASTICITY OF DEMAND

	P₁	P₂	Q_D1	Q_D2	I	II	III	IV	V
1	1	2	10	5
2	5	3	40	90
3	12	20	200	200
4	3	2	9	9
5	0.40	1.40	30	15
6	1.2	4.0	20	15
7	7.5	4.6	40	30
8	5	5.000â¦01	1x10⁶	0
9	5	4.9999â¦.	10	1x10⁹
10	6	12	12	6
11	18	36	360	180
12	7	15	24	16
13	7	16	78	78
14	25	65	150	100
15	65	91	1300	780
16	4	5	21	11
17	8	4	30	54
18	140	275	625	495
19	78	91	780	780
20	91	78	780	780

Column I - determine the Price-Elasticity of Demand Coefficient. Find material in Chapter 6 and the Powerpoint of Elasticity Chap 004 19e.ppt

change in quantity demanded change in price

E_D = ---------------------------------------- â ----------------------------

sum of quantities demanded / 2 sum of prices / 2

The data in the first four columns represent price (P) and quantity demanded (Qd) in time 1 (before change in price) and time 2 (after change in price). Note that results should be expressed in absolute terms (see paragraph Elimination of Minus Sign). For example, -1 should be expressed as â1â.

Column II â Based on topic concerning Interpretations of E_D, indicate which applies based on how the quantity demanded changed subsequent to a change in price (elastic, inelastic, etc.)

Column III - you need to determine if the good in question would be considered a necessity, a luxury or neither.

Column IV â Indicate, in monetary terms, how much is the change in total revenue or total expenditure (TR = P X Q_D), from the first price level to the second.

Column V - the direction of the change, also in monetary terms, that is, increasing or decreasing, and by how much? (show a + sign for increasing and a â sign for decreasing).

Note: for any monetary result please include the applicable currency symbol ($, â¬, etc.)

salmoneagle868

1. Clothing retailers often use sales, where some or all products are sold at a discount price, to increase revenue. What does this suggest about the price elasticity of demand for retail clothing?

A) It is elastic.

B) It is inelastic.

C) It is unit elastic.

D) This tells us nothing about elasticity.

2. If demand is inelastic, then increasing price will do what to revenue?

A) It is impossible to say.

B) Decrease

C) Increase

D) Nothing will happen to revenue.

3. If P increases from 200 to 202 and Qd decreases from 50 to 49, what is the price elasticity of demand? ___

4. If elasticity (i.e. price elasticity of demand) is -3, a 1.5% increase in price would lead to what change in quantity demanded?

A) a decrease of 3%

B) a decrease of 4.5%

C) an increase of 1.5%

D) an increase of 3%

5. If you know that the demand curve is given by: Q = 20-2P What is the price elasticity of demand if P = 4?

A) -0.666

B) -0.33

C) -1.33

D) -1.66

ECON 1B03 Lecture 1: ECON 1B03- Week 5 Module 2

ECON 1B03 Full Course Notes

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