ECON101 Lecture Notes - Lecture 8: Root Mean Square, Demand Curve

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magentamosquito756

4 Apr 2017

School

University of Waterloo

Department

Economics

Course

ECON101

Professor

Corey Van De Waal

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Demand: summary: a change in the price of the commodity (pc) will cause a movement along the demand curve. A change in quantity demanded : a change in any one of the variables or any combinations of variables will cause the demand curve to shift left or right. A change in demand : exception to the normal negative sloped demand curve: Expectations of price change: more of a commodity is bought at a high price, relative to a low price because consumers expect the price to rise even higher and the opposite hold true. Price quality relationship: if consumers have limited knowledge of the composition of the commodity, often what they do is use the price as an index of quality. Exactly like demand, supply is a ow concept and because it is a ow concept we express it as so many units per period of time: sc= f(pc, cf, poc, efp, fn, t)

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Please review the following work and correct me if I have mixed up the concepts of movements and shifts of supply and demand curves. Feel free to copy and edit/correct my mistakes. I'll be waiting. Thanks in advance!!

Changes in price dictate movements along demand curves. When a decrease in demand or the quality demanded occurs it's a safe bet that it's correlated to a price increase, which in turn leads to a resultant surplus of that particular commodity in the marketplace. This is because decreased demand means less of that commodity being sold. On the other hand, a price decrease usually leads to an increase in the demand for a particular commodity, or an increase in sales, which in turn leads to a shortage of that commodity in the marketplace.

To shift the demand curve itself, changes need to occur in other aspects of the market beyond simply a change in the price of a commodity. For example, an increase in income means the consumers have more disposable income. With more disposable income, demand for commodities will increase, and results in a shift of the demand curve itself. In this example, the demand curve would shift right. On the opposite side of the coin, cost increases due to production or losses in efficiency may decrease the side of supply, shifting the demand curve to the left.

Analogous to shifts in the demand curve, shifts along a supply curve occur when prices change as well. When the cost to produce a commodity increases, supply drops, and the supply curve shifts to the left. If the cost of production drops, and supply increases, the supply curve shifts to the right as demand develops.

Pharmaceutical supply and demand is an easy way to understand these concepts.

Drug demand increases: Price decreases, supplies decrease.

Drug demand decreases: Price increases, supplies increase.

Drug supply increases: Production costs drop, demand drops.

Drug supply decreases: Production costs increase, demand increases.

"But where and how do movements and shifts occur in the above?"

purpleworm770

True or False. If False explain why it's false.

1. If all prices are doubled an money income is the left the same, the budget set does not change because the relative prices do not change.

2. A decrease in income pivots the budget line around the bundle initially consumed.

3. If preferences are well-behaved, then for any commodity bundle (x1,x2), the set of commodity bundles that are worse than (x1,x2) is a convex set.

4. The marginal rate of substitution measures the distance betwee one indifference curve and the next one.

5. If someone has the utility function U= 2min(x, y), then x and y are perfect complements for that person.

6. At the boundary optimum, a consumers indifference curve must be tangent to her budget line.

7. If two goods are substitutes, then an increase in the price of one of them will increase the demand for the other.

8. An Engel curve is a demand curve with the vertical and horizontal axes reversed.

9. An inferior good is less durable than a normal good.

10. When other variables are held fixed, the demand for a Giffen good rises when income increase.

17. Which of the following is a determinant of supply?

A. Tastes and preferences

B. Price of a complementary good

C. Consumer income

D. Technology

18. A market is in equilibrium:

A. provided there is no surplus of the product

B. at all prices above that shown by the intersection of the supply and demand curves

C. if the amount producers want to sell is equal to the amount consumers want to buy

D. whenever the demand curve is downsloping and the supply curve is upsloping.

19. If the market price is above the equilibrium price:

A. A shortage will occur and producers will produce more and lower prices

B. A surplus will occur and producers will produce less and lower prices

C. A surplus will result and consumers will bid prices up

D. Producers will make extremely high profits

20. The market system automatically corrects a surplus condition in a competitive market by:

A. Raising the price of the commodity in question while increasing the quantity demanded

B. Raising the price of the commodity in question while decreasing the quantity demanded

C. Reducing the price of the commodity in question while increasing the quantity demanded

D. Reducing the price of the commodity in question while decreasing the quantity demanded

21. The price elasticity of demand measures:

A. buyer responsiveness to price changes.

B. the extent to which demand curve shifts as incomes change.

C. the slope of the demand curve.

D. how far business executives can stretch their fixed costs

22. The elasticity of demand for a product is likely to be greater:

A. if the product is a necessity, rather than a luxury good.

B. the greater the amount of time over which buyers adjust to a price change

C. the smaller the proportion of one's income spent on the product.

D. the smaller the number of substitute products available.

23. Market failure is said to occur whenever:

A. private markets do not allocate resources in the most economically desirable way

B. prices rise

C. some consumers who want a good do not obtain it because the price is higher than they are willing to pay

D. government intervenes in the functioning of private markets.

24. A negative externality or spillover cost occurs when:

A. firms fail to achieve allocative efficiency.

B. firms fail to achieve productive efficiency.

C. the price of the good exceeds the marginal cost of producing it.

D. the total cost of producing a good exceeds the costs borne by the producer

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ECON101 Lecture Notes - Lecture 8: Root Mean Square, Demand Curve

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