In a pie chart, the population of a city is represented by a sector 45°. If the country has a population of 10 million people, then the city's population is
The table below shows the composition of exports and imports of a hypothetical country. Use the information in the table to answer the questions that follow. Exports | Amount ($) | Imports | Amount ($) Crude oil | 120,000,000 | Rice and flour | 140,000,000 Groundnuts | 40,000,000 | Petroleum product | 80,000,000 Tourism | 45,000,000 | Vehicles and accessories | 50,000,000 Shipping & Insurance | 60,000,000 | Banking services | 60,000,000 Bauxite | 80,000,000 | Freight and insurance | 40,000,000 (a) Calculate the value of visible exports. (b) Calculate the balance of trade for the country. (c) List the items of invisible exports and imports. (d) Calculate the current account balance of the country. (e) Is the country developed or developing? Give one reason for your answer.
Show the model answer
Model answer
(a) Visible exports = crude oil 120 m + groundnuts 40 m + bauxite 80 m = $240,000,000 (b) Visible imports = rice and flour 140 m + petroleum products 80 m + vehicles 50 m = $270,000,000; balance of trade = 240 m − 270 m = −$30,000,000 (deficit) (c) Invisible exports: tourism; shipping and insurance. Invisible imports: banking services; freight and insurance. (d) Invisible exports = 105 m; invisible imports = 100 m; current account = (240 + 105) − (270 + 100) = 345 m − 370 m = −$25,000,000 (deficit) (e) Developing: it exports mainly primary products (crude oil, groundnuts, bauxite) and imports food, refined petroleum and manufactured goods.
Explanation
Visible items are goods; invisible items are services.
The cost and output schedule of a firm is shown in the table below. Output (kg) | 0 | 15 | 35 | 60 | 85 Variable cost ($) | 0 | 30 | 55 | 75 | 90 Total cost ($) | 15 | 45 | 70 | 90 | 105 Total revenue ($) | 0 | 30 | 70 | 120 | 170 (a) Using the data in the table, at each level of output, calculate the firm's: (i) marginal revenue; (ii) marginal cost. (b) At what output level did the firm: (i) break even; (ii) make the highest profit; (iii) attain equilibrium? (c) Identify the market structure in which the firm operates.
Show the model answer
Model answer
(a)(i) MR = ΔTR/ΔQ: 0→15 kg: 30/15 = $2; 15→35: 40/20 = $2; 35→60: 50/25 = $2; 60→85: 50/25 = $2 (ii) MC = ΔTC/ΔQ: 0→15: 30/15 = $2; 15→35: 25/20 = $1.25; 35→60: 20/25 = $0.80; 60→85: 15/25 = $0.60 (b)(i) Break-even at 35 kg (TR = TC = $70). (ii) Highest profit at 85 kg: 170 − 105 = $65 (profits: −15, −15, 0, 30, 65). (iii) MC = MR ($2) at 15 kg; but MC is falling there, so the profit-maximising equilibrium in the table is 85 kg, the output with the highest profit (MR > MC beyond 15 kg). (c) Perfect competition: MR (= price = $2 per kg) is constant at every output.
Explanation
Divide each change in TR or TC by the change in output, since output rises in uneven steps.
(a) Define optimum population. (b) In what three ways can rapid population growth slow down the rate of economic development? (c) Describe any three measures that can be adopted to control rapid population growth.
Show the model answer
Model answer
(a) Optimum population is the population size which, combined with the available resources and technology, gives the highest output (income) per head. (b) Any three: reduces savings and investment because more income is consumed; high dependency ratio; pressure on social services and infrastructure; unemployment; food shortages; lower per capita income; environmental degradation; rural-urban migration and slums. (c) Any three: family planning and use of contraceptives; education, especially of girls; raising the age of marriage; limiting tax relief/benefits to a few children; public enlightenment campaigns; improving the status of women; restricting immigration.
(a) What are state-owned enterprises? (b) State any three reasons for the establishment of state-owned enterprises. (c) Highlight any four problems associated with state-owned enterprises.
Show the model answer
Model answer
(a) State-owned enterprises are businesses owned, financed and controlled by government (federal, state or local) to provide goods and services, e.g. public corporations. (b) Any three: to provide essential services that need huge capital; to prevent exploitation by private monopolies; to control strategic industries; to create employment; to promote balanced regional development; to generate revenue; to protect national interest from foreign domination. (c) Any four: inefficiency; political interference; corruption and embezzlement; over-staffing; inadequate funding; frequent losses requiring subsidies; poor maintenance; bureaucracy; lack of accountability.
Explanation
Reasons usually concern welfare and control rather than profit.
(a) Differentiate between unemployment and underemployment. (b) With one example each, explain the following: (i) seasonal unemployment; (ii) structural unemployment; (iii) frictional unemployment; (iv) cyclical unemployment.
Show the model answer
Model answer
(a) Unemployment is when people who are willing and able to work at the current wage cannot find jobs. Underemployment is when people work below their capacity: fewer hours than they want, or in jobs below their skills (e.g. an engineer driving a taxi). (b)(i) Seasonal: caused by seasonal changes in demand or weather, e.g. farm labourers in the dry season. (ii) Structural: caused by long-term changes in the structure of the economy or technology, e.g. typists replaced by computers, coal miners when oil replaced coal. (iii) Frictional: short-term, while workers move between jobs or search for jobs, e.g. a graduate looking for a first job. (iv) Cyclical: caused by a fall in total demand during a recession/depression, e.g. factory workers laid off in an economic slump.
(a) What is commodity money? (b) Identify any three problems associated with trade by barter. (c) Explain any three ways by which the advent of money has solved the problems of the barter system.
Show the model answer
Model answer
(a) Commodity money is a good that has value in itself and is generally accepted as a medium of exchange, e.g. cowries, salt, cattle, gold. (b) Any three: double coincidence of wants; lack of a common measure of value; indivisibility of goods; difficulty of storing wealth; no standard of deferred payment; difficulty of transporting goods. (c) Any three: as a medium of exchange it removes the need for double coincidence of wants; as a unit of account it gives a common measure of value; it is divisible into small units; as a store of value it allows wealth to be saved; as a standard of deferred payment it makes borrowing and credit possible; it is portable.
Explanation
Match each barter problem with the function of money that solves it.
(a) What is a demand schedule? (b) State the law of demand. (c) Using appropriate examples, explain the following types of demand: (i) competitive demand; (ii) derived demand; (iii) joint demand; (iv) composite demand.
Show the model answer
Model answer
(a) A demand schedule is a table showing the quantities of a commodity that consumers are willing and able to buy at various prices at a given time. (b) Other things being equal, the higher the price of a commodity, the lower the quantity demanded, and the lower the price, the higher the quantity demanded. (c)(i) Competitive demand: demand for goods that are substitutes, e.g. tea and coffee; a rise in the price of one raises demand for the other. (ii) Derived demand: a good or factor is demanded because of what it helps to produce, e.g. labour or cement demanded because of demand for houses. (iii) Joint demand: goods demanded together, e.g. car and petrol, torch and battery. (iv) Composite demand: a good demanded for several different uses, e.g. sugar for soft drinks, confectionery and home use; wood for furniture and fuel.
(a) What is a tax? (b) Describe the following rates of taxation: (i) progressive tax; (ii) proportional tax; (iii) regressive tax. (c) Explain the following principles of a good tax system: (i) equity; (ii) convenience; (iii) economy.
Show the model answer
Model answer
(a) A tax is a compulsory payment levied by government on individuals and firms, for which no direct service is given in return. (b)(i) Progressive: the rate of tax rises as income rises (the rich pay a higher percentage). (ii) Proportional: the same rate (percentage) is charged at all levels of income. (iii) Regressive: the rate of tax falls as income rises, so the poor pay a higher percentage of their income. (c)(i) Equity: tax should be fair and based on ability to pay. (ii) Convenience: the time and method of payment should suit the taxpayer (e.g. PAYE deducted from salary). (iii) Economy: the cost of collecting the tax should be small compared with the revenue it yields.