Tag: Economics – Others

Consider a three-period model of intertemporal consumption.
Suppose the representative consumer has the following lifetime utility function:
V = c + c′ + c′′
The consumer’s consumption must satisfy the following budget constraints each period:
Period 1: c + s1 = y
Period 2: c′ + s2 = y′ + (1 + r1) s1
Period 3: c′′ = y′′ + (1 + r2) s2
where c, c′, c′′ represent the consumer’s consumption in the first, second, and third period, respectively, and s1 and s2 represent her savings in period 1 and period 2. y, y′, y′′ are exogenously given income in each period, respectively. r1 and r2 are the exogenously given real interest rates the consumer faces when considering saving or borrowing in periods one and two, respectively.
Question 12.1 Q12.11 PointGrading comment: How does the consumer’s given lifetime utility function reflect her level of patience?
The consumer values future consumption more than current consumption.
The consumer values current consumption more than future consumption.
The consumer does not discount future consumption at all.
The implication varies depending on the given values of the real interest rates.
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Question 12.1: Last saved on May 19 at 3:21 PM
Question 12.2 Q12.21 PointGrading comment: Find the consumer’s lifetime budget constraint.
The following multiple-choice options contain math elements, so you may need to read them in your screen reader’s “reading” or “browse” mode instead of “forms” or “focus” mode.
c + 1/(1 + r1) c′ + 1/((1 + r1)(1 + r2)) c′′ = y + 1/(1 + r1) y′ + 1/((1 + r1)(1 + r2)) y′′
c + 1/(1 + r2) c′ + 1/((1 + r1)(1 + r2)) c′′ = y + 1/(1 + r2) y′ + 1/((1 + r1)(1 + r2)) y′′
c + (1 + r1) c′ + (1 + r1)(1 + r2) c′′ = y + (1 + r1) y′ + (1 + r1)(1 + r2) y′′
c + (1 + r2) c′ + (1 + r1)(1 + r2) c′′ = y + (1 + r2) y′ + (1 + r1)(1 + r2) y′′

(i) There are single-person households in the data set.
(ii) Use OLS to estimate the following model: nettfa = β0 + β1 inc + β2 age + u. The estimated equation is: nettfaˆ = β0 + β1 inc + β2 age. The slope coefficient on inc indicates that one more dollar in annual family income (holding age fixed) results in approximately a in predicted net financial wealth. The slope coefficient on age indicates that one less year of age (holding inc fixed) results in a in predicted net financial wealth.
(iii) The intercept gives the predicted net financial wealth when the predictors (annual family income and the age of the survey respondent) are greater than 0. True False
The intercept is not meaningful because several people in the sample have annual family incomes of $0 or are 0 years of age. True False
(iv) Use the test for H0: β2 = 1 against H1: β2 < 1 to answer the following questions. The t statistic is . The p-value is . At the 1% significance level, you H0H0. (v) The correlation between annual family income and age of the survey respondent in the sample of single-person households is approximately . Use OLS to estimate the following model: nettfa = β0 + β1 inc + u. The estimated equation is: nettfaˆ = β0 + β1 inc. Which of the following best explains why the slope estimate associated with annual family income in the multiple regression (nettfa = β0 + β1 inc + β2 age + u) is not much different from the slope estimate found in the simple regression (nettfa = β0 + β1 inc + u)? The partial effect of age on nettfaˆ is negative in the sample. The correlation between inc and age in a single-person household is insignificant. The partial effect of age on nettfaˆ is positive in the sample. The correlation between inc and age in a single-person household is significant.

There are single-person households in the data set.
Use OLS to estimate the following model: nettfa = β0 + β1 inc + β2 age + u. The estimated equation is: nettfaˆ = β̂0 + β̂1 inc + β̂2 age. The slope coefficient on inc indicates that one more dollar in annual family income (holding age fixed) results in approximately a in predicted net financial wealth. The slope coefficient on age indicates that one less year of age (holding inc fixed) results in a in predicted net financial wealth.
The intercept gives the predicted net financial wealth when the predictors (annual family income and the age of the survey respondent) are greater than 0. TrueFalse The intercept is not meaningful because several people in the sample have annual family incomes of $0 or are 0 years of age. TrueFalse
Use the test for H0: β2 = 1 against H1: β2 < 1 to answer the following questions. The t statistic is . The p-value is . At the 1% significance level, you H0. The correlation between annual family income and age of the survey respondent in the sample of single-person households is approximately . Use OLS to estimate the following model: nettfa = β0 + β1 inc + u. The estimated equation is: nettfaˆ = β̂0 + β̂1 inc. Which of the following best explains why the slope estimate associated with annual family income in the multiple regression (nettfa = β0 + β1 inc + β2 age + u) is not much different from the slope estimate found in the simple regression (nettfa = β0 + β1 inc + u)? The partial effect of age on nettfaˆ is negative in the sample. The correlation between inc and age in a single-person household is insignificant. The partial effect of age on nettfaˆ is positive in the sample. The correlation between inc and age in a single-person household is significant.

Suppose that two firms, Hatte Latte and Bean Bruuer, are the only sellers of espresso in some hypothetical market. The following payoff matrix gives the profit (in millions of dollars) earned by each company depending on whether or not it chooses to advertise:
Bean Bruuer: Advertise
Bean Bruuer: Doesn’t Advertise
Hatte Latte: Advertise
10, 10
18, 2
Hatte Latte: Doesn’t Advertise
2, 18
11, 11
For example, the lower left cell of the matrix shows that if Bean Bruuer advertises and Hatte Latte does not advertise, Bean Bruuer will make a profit of $18 million, and Hatte Latte will make a profit of $2 million. Assume this is a simultaneous game and that Hatte Latte and Bean Bruuer are both profit-maximizing firms.
If Hatte Latte chooses to advertise, it will earn a profit ofmillion if Bean Bruuer advertises and a profit ofmillion if Bean Bruuer does not advertise.
If Hatte Latte chooses not to advertise, it will earn a profit ofmillion if Bean Bruuer advertises and a profit ofmillion if Bean Bruuer does not advertise.
If Bean Bruuer advertises, Hatte Latte makes a higher profit if it chooses .
If Bean Bruuer doesn’t advertise, Hatte Latte makes a higher profit if it chooses .
Suppose that both firms start off by deciding not to advertise. If the firms act independently, what strategies will they end up choosing?
Both firms will choose to advertise.
Hatte Latte will choose to advertise and Bean Bruuer will choose not to advertise.
Hatte Latte will choose not to advertise and Bean Bruuer will choose to advertise.
Both firms will choose not to advertise.
Again, suppose that both firms start off not advertising. If the firms decide to collude, what strategies will they end up choosing?
Both firms will choose to advertise.
Both firms will choose not to advertise.
Hatte Latte will choose to advertise and Bean Bruuer will choose not to advertise.
Hatte Latte will choose not to advertise and Bean Bruuer will choose to advertise.

ASSIGNMENT QUESTIONS:
SECTION 1
the aggregate demand of flue relatedQuestion 1 medicines during the Covid-19 period caused a rise in their prices.
1.2 Kellogg’s sells cornflakes at R50 for a 1 kg pack. What is the effect on supply and demand if the price of milk falls?
1.3 You have been approached to be part of the SARB team responsible for putting in place measures that can combat inflation. Outline five (5) measures (10) of your advice.
1.4 SASOL is a dominant force in the chemical and energy industry in South Africa. Determine the market structure that resembles SASOL and explain how they can compete in the identified market.
1.5 With the aid of practical examples, explain the conditions under which a business is able to engage in price discrimination.
SECTION 2: CASE STUDY
CASE STUDY: South Africa – Improving productivity and the efficiency of public spending to bolster living standardsBy Falilou Fall, OECD Economics Department, August 25, 2022South Africa needs bold structural reforms to lift economic growth. The coronavirus crisis, flooding in Kwa-Zulu Natal and widespread electricity cuts have weakened an already fragile economy (Figure 1). GDP growth is projected to slow to 1.8% and 1.3% in 2022 and 2023, respectively. The war in Ukraine is creating additional risks: on the one hand, rising commodity prices are prolonging the commodity boom cycle, but, on the other hand, higher inflation is denting purchasing power. The social distress relief grant, put in place during the pandemic and covering up to 10.5 million individuals, has helped mitigate the effects of the crisis and inflation on poverty, but may not be sufficient if the economy does not grow faster: unemployment stood at 34.5% in the first quarter of 2022. The repo rate changes continue to affect the economy in different ways.Figure 1. Electricity availability has fallen dramaticallyYearly hours of load shedding by stages and total annual supply in TWh.

matrix shows the profit (in millions of dollars) each company will earn depending on whether or not it advertises:
Beantown Advertise Doesn’t Advertise
Expresso Advertise 10, 10 18, 2
Doesn’t Advertise 2, 18 11, 11
Payoff matrix (Expresso payoff, Beantown payoff)
Beantown: Advertise
Beantown: Doesn’t Advertise
Expresso: Advertise
10, 10
18, 2
Expresso: Doesn’t Advertise
2, 18
11, 11
For example, the upper right cell shows that if Expresso advertises and Beantown doesn’t advertise, Expresso will make a profit of $18 million, and Beantown will make a profit of $2 million. Assume this is a simultaneous game and that Expresso and Beantown are both profit-maximizing firms.
If Expresso decides to advertise, it will earn a profit ofmillion if Beantown advertises and a profit ofmillion if Beantown does not advertise.
If Expresso decides not to advertise, it will earn a profit ofmillion if Beantown advertises and a profit ofmillion if Beantown does not advertise.
If Beantown advertises, Expresso makes a higher profit if it choosesnot to advertise .
If Beantown doesn’t advertise, Expresso makes a higher profit if it choosesto advertise .
Suppose that both firms start off not advertising. If the firms act independently, what strategies will they end up choosing?
Both firms will choose not to advertise.
Both firms will choose to advertise.
Expresso will choose to advertise and Beantown will choose not to advertise.
Expresso will choose not to advertise and Beantown will choose to advertise.
Again, suppose that both firms start off not advertising. If the firms decide to collude, what strategies will they end up choosing?
Expresso will choose to advertise and Beantown will choose not to advertise.
Both firms will choose not to advertise.
Expresso will choose not to advertise and Beantown will choose to advertise.
Both firms will choose to advertise.
It might be easier for Expresso and Beantown to achieve the cooperative outcome of the game if:
The payoffs of the game were doubled
The game had repeated trials
The payoffs of the game were cut in half
It were difficult to monitor whether the other player was advertising

2. Calculating marginal revenue from a linear demand curve
The blue curve on the following graph represents the demand curve facing a firm that can set its own prices. Use the graph input tool to help you answer the following questions. You will not be graded on any changes you make to this graph.
051015202530354045502502252001751501251007550250 PRICE (Dollars per unit) QUANTITY (Units) Demand Graph Input Tool Market for Goods Quantity Demanded(Units) Demand Price(Dollars per unit)
On the graph input tool, change the number found in the Quantity Demanded field to determine the prices that correspond to the production of 0, 10, 20, 25, 30, 40, and 50 units of output. Calculate the total revenue for each of these production levels. Then, on the following graph, use the green points (triangle symbol) to plot the results.
Total Revenue
0510152025303540455031302817250421911878156512529396263130 TOTAL REVENUE (Dollars) QUANTITY (Number of units)
Calculate the total revenue if the firm produces 10 versus 9 units. Then, calculate the marginal revenue of the 10th unit produced.
The marginal revenue of the 10th unit produced is.
Calculate the total revenue if the firm produces 20 versus 19 units. Then, calculate the marginal revenue of the 20th unit produced.
The marginal revenue of the 20th unit produced is.
Based on your answers from the previous question, and assuming that the marginal revenue curve is a straight line, use the black line (plus symbol) to plot the firm’s marginal revenue curve on the following graph.
Marginal Revenue
051015202530354045502502252001751501251007550250 -25 -50 MARGINAL REVENUE (Dollars) QUANTITY (Units)
Comparing your total revenue graph to your marginal revenue graph, you can see that total revenue is at the output at which marginal revenue is equal to zero.

Case Study 15: The Copper Cable Conundrum in a Competitive MarketZambiaLink Cables Ltd. is a mid-sized firm producing copper wires and cables for export and domestic use. The company recently entered a regional Southern African market where numerous small and large firms operate under conditions of imperfect competition. The management observed aggressive marketing campaigns and slight variations in product specifications across competitors, which gave them reason to believe that the market is structured under monopolistic competition.The firm must decide how to set its pricing policy given its lack of total market control. A consultant economist was hired to evaluate ZambiaLink’s strategy. The consultant noted that while the market exhibited many sellers and similar but differentiated products, entry and exit were relatively easy. Additionally, consumer loyalty was influenced by branding and advertising, not price alone. ZambiaLink, currently breaking even, is considering shifting its strategy to include stronger brand identity, investment in quality differentiation, and potential price increases to reflect perceived value.
REQUIRED:1. Identify and explain the characteristics of the market structure ZambiaLink is currently operating in. How does this structure influence the firm’s pricing strategy?2. How does product differentiation affect the pricing decisions in monopolistic competition, and what implications does this have for ZambiaLink’s branding efforts?3. What role does advertising play in market structures with imperfect competition? Discuss the potential impact of increased advertising on ZambiaLink’s demand curve.4. Evaluate the degree of pricing power ZambiaLink has within its market structure. What factors determine this degree of pricing discretion?5. If ZambiaLink were to transition into a more oligopolistic market due to mergers and acquisitions in the industry, how would this shift affect its pricing and non-price competition strategies?

What is the midpoint method for calculating price elasticity of demand?
Part 2 The midpoint method for calculating price elasticity of demand is:
Part 3
the change in quantity divided by the average of the initial and final quantities divided by the change in price divided by the average of the initial and final prices.
the change in quantity divided by the initial quantity divided by the change in price divided by the initial price.
the average of the initial and final quantities divided by the average of the initial and final prices.
the change in quantity divided by the average of the initial and final quantities divided by price.
the change in quantity divided by the average of the initial and final quantities divided by the change in price divided by the initial price.
Part 4 How else can you calculate the price elasticity of demand?
Part 5
Price elasticity of demand can be calculated using final values for price and quantity.
Price elasticity of demand can be calculated using initial values for price and quantity.
Price elasticity of demand can be calculated by finding the slope of the demand curve.
Both a and b.
All of the above.
Part 6 What is the advantage of the midpoint method?
Part 7
The midpoint formula will give the same value whether moving from the higher price to the lower price or from the lower price to the higher price.
The midpoint formula will give the same value as the price elasticity of demand when using the higher price and the higher quantity.
The midpoint formula is easier to calculate.
The midpoint formula will give the same value as the price elasticity of demand when using the higher price and the lower quantity.
The midpoint formula will give the same value as the price elasticity of demand when using the final price and the final quantity.

OUESTION 1(10)The National Energy Regulator of South Africa (NERSA) is a regulatory authority established as a juristic person in terms of Section 3 of the National Energy Regulator Act, 2004 (Act No. 40 of 2004). NERSA’s mandate is to regulate the electricity, piped gas and petroleum pipelines industries in terms of the Electricity Regulation Act, 2006 (Act No. 4 of 2006), Gas Act, 2001 (Act No. 48 of 2001) and Petroleum Pipelines Act, 2003 (Act No. 60 of 2003). Suppose the provision of natural gas, that has three-stage process (i.e. production, transportation and distribution), leads to the emergency of a natural monopoly. The long-run unit cost of output for this natural monopoly declines throughout the relevant range of output. Suppose the socially optimal level of output for this natural monopoly, is at a point where the price would be well below the average cost per unit but equal to short-run and long-run marginal cost. Also, from a social perspective, competition results in inefficiency in the form of quite high per unit cost for the competitive firm than the unit cost for the monopoly that is enjoying economies of scale (monopoly output could be say ten times larger than that of the competitive firm). However, if a monopolistic position were to exist in the absence of regulation, the monopolist would maximize profit by equating marginal revenue and marginal cost (profit maximization condition) at a monopoly output (which is smaller than the socially optimal level of output), leading to a higher price and lower output. Thus, intervention through regulation is required to achieve the benefits of the most efficient organization of production.
Discuss, in less than one hundred and fifty (150) words, any four practical problems encountered in the public utility regulation of the provision of such utilities as electricity.