ECN 001: PRINCIPLES OF ECONOMICS I

The market for Nigerian cassava flour has the following demand and supply equations:

QD + 15P = 1500
QS = 5P – 300

Suppose the market price per bag is observed by the government to be very cheap and government decided to increase the price to N950 per bag,

(a) Calculate the equilibrium price and quantity before the price increase. [5 marks]

(b) What are the new quantities demanded and supplied after the price increase. [5 marks]

(c) Briefly explain the effect of the price increase on the consumers and farmers. [5 Marks]
(a) What is a perfectly competitive market? Briefly discuss the characteristics of a Perfect competitive markets. [5 marks]

(b) With the aid of a diagram, discuss the necessary and sufficient equilibrium conditions for a perfectly competitive market. [8 marks]

(c) Explain the term Price Discrimination. [2 marks]

ECN 002: PRINCIPLES OF ECONOMICS II

(a) Discuss the key functions of money. [9 Marks]

(b) With the use of adequate examples, explain the basic motives for keeping money in liquid form by individuals in an economy. [6 Marks]
(a) Discuss the Keynesian view of the equilibrium output and full employment level. [8 Marks]

(b) Using an appropriate diagram, explain the concept of inflationary and deflationary gaps. [7 Marks]

ECN 003: APPLIED ECONOMICS I

On 20th August 2019, Nigeria partially closed its land border with its neighbouring countries. As a student of Economics, assess the

(a) economic implications of this on the Nigeria economy. [12 marks]

(b) effect of this on the trade relationship between Nigeria and her neighbouring countries. [3 marks]
(a) Discuss the statement that reads "Economic growth is a necessary but not sufficient condition for Economic development". [10 marks]

(b) For many years ago, Nigeria has consistently been having deficit Balance of Payment. As a student of Economics, what could likely be the reasons for this? [5 marks]

ECN 004: APPLIED ECONOMICS II

(a) Define the term globalization. [2 marks]

(b) What are the contributions of globalization towards economic development? [8 marks]

(c) Highlight the functions of International Monetary Fund (IMF). [5 marks]
All countries of the world focused majorly on economic growth as the most important goal among other development goals. This is because, achieving economic growth can lead to the achievement of economic development which is the ultimate. However, there is always an opportunity cost of achieving any of these goals.

(a) Differentiate between economic growth and economic development. [5 marks]

(b) Aside from economic growth, critically examine other development goals that you know. [10 marks]

SOLUTIONS: ECN 001–004

ECN 001: PRINCIPLES OF ECONOMICS I

Question 1

Given:

QD + 15P = 1500 → QD = 1500 – 15P
QS = 5P – 300

(a) Equilibrium Price and Quantity

At equilibrium, QD = QS:

1500 – 15P = 5P – 300

1500 + 300 = 5P + 15P

1800 = 20P

P = ₦90

QD = 1500 – 15(90) = 1500 – 1350 = 150 bags

Check: QS = 5(90) – 300 = 450 – 300 = 150 ✓

Equilibrium Price = ₦90; Equilibrium Quantity = 150 bags

(b) New Quantities at P = ₦950

New QD = 1500 – 15(950) = 1500 – 14,250 = –12,750

Since quantity cannot be negative, QD = 0 (no consumer will buy at that price)

New QS = 5(950) – 300 = 4,750 – 300 = 4,450 bags

At ₦950, quantity demanded collapses to zero while quantity supplied rises to 4,450 bags — a massive surplus.

(c) Effect of Price Increase on Consumers and Farmers

On Consumers:

The price rise from ₦90 to ₦950 is a tenfold increase, making cassava flour unaffordable for most Nigerians.
Consumers will reduce or completely stop purchasing cassava flour, turning to cheaper substitutes.
Consumer surplus is drastically reduced, and welfare falls, especially for low-income households who depend on cassava as a staple.

On Farmers (Suppliers):

Farmers benefit in the short run — higher prices mean higher revenue per bag sold.
The higher price incentivises more production (QS jumps from 150 to 4,450 bags).
However, if consumers cannot afford the product, unsold surpluses will accumulate, leading to losses and potential wastage.
In the long run, farmers may face reduced demand and may need to lower prices or diversify.

Question 2

(a) Perfectly Competitive Market & Its Characteristics

A perfectly competitive market is a market structure in which there are many buyers and sellers trading a homogeneous product, with no single participant having the power to influence the market price.

Characteristics:

Large number of buyers and sellers — no single firm is large enough to affect price.
Homogeneous products — all firms sell identical goods; no differentiation.
Free entry and exit — no barriers prevent new firms from entering or exiting.
Perfect information — buyers and sellers have full knowledge of prices and products.
Price takers — each firm accepts the market price as given (P = MR = AR).
No transport costs — goods are sold at a uniform price throughout the market.
No government intervention — price is determined purely by demand and supply.

(b) Equilibrium Conditions for a Perfectly Competitive Market

Necessary Condition (First-Order Condition):
The firm maximises profit where Marginal Cost (MC) = Marginal Revenue (MR).

Since MR = Price in perfect competition:

MC = MR = P

Sufficient Condition (Second-Order Condition):
The MC curve must be rising (cutting MR from below) at the equilibrium point, ensuring it is a profit maximum, not a minimum.

Short-Run Diagram:

Price/Cost  
    |          MC      ATC  
    |         /       /  \  
    |        /    ATC/    \  
P=MR|-------/---------------- (Price line = MR = AR = D)  
    |      /   
    |     /  
    |____/____________________  
              Q*          Quantity  
  
At Q*, MC = MR = P (Necessary condition met)  
MC curve slopes upward through MR (Sufficient condition met)

Long-Run Equilibrium:
In the long run, economic profit = 0, so:

P = MC = MR = AC (minimum)

This is because free entry eliminates supernormal profit until price equals minimum average cost.

(c) Price Discrimination

Price Discrimination is the practice whereby a seller charges different prices to different buyers for the same good or service, not based on cost differences, but based on their willingness or ability to pay.

Types:

First-degree: Each consumer is charged their maximum willingness to pay.
Second-degree: Price varies with quantity consumed (e.g., bulk discounts).
Third-degree: Different prices charged to distinct consumer groups (e.g., students vs. adults).

Condition: The seller must have market power, and markets must be separable with no resale possible.

ECN 002: PRINCIPLES OF ECONOMICS II

Question 3

(a) Key Functions of Money

Money performs the following essential functions:

Medium of Exchange — Money eliminates the double coincidence of wants problem of barter by serving as a universally accepted means of payment for goods and services.
Unit of Account (Measure of Value) — Money provides a common standard for measuring and comparing the value of goods and services (e.g., pricing in Naira).
Store of Value — Money retains purchasing power over time, allowing individuals to save wealth for future use (unlike perishable goods).
Standard of Deferred Payment — Money facilitates credit transactions by providing an agreed measure for future payments of debts and loans.
Transfer of Value — Money enables the transfer of purchasing power across time and geography easily.
Liquidity — Money is the most liquid of all assets, immediately usable without conversion.

(b) Motives for Holding Money in Liquid Form (Keynes)

Keynes identified three motives for liquidity preference (holding money rather than interest-bearing assets):

Transactions Motive — Individuals and firms hold money to finance day-to-day transactions between income receipts and expenditure periods.
- Example: A worker paid monthly holds cash to buy food, transport, and utilities throughout the month.
Precautionary Motive — Money is held to guard against unforeseen emergencies or contingencies such as illness, accidents, or sudden loss of income.
- Example: A Nigerian trader keeps extra cash in case a supplier demands immediate payment or machinery breaks down.
Speculative Motive — Money is held in liquid form to take advantage of future investment opportunities when asset prices are expected to fall (i.e., when interest rates are expected to rise).
- Example: An investor holds cash rather than buying bonds because they expect bond prices to fall (interest rates to rise), then buys bonds cheaply later.

The higher the interest rate, the lower the demand for speculative money balances (inverse relationship).

Question 4

(a) Keynesian View of Equilibrium Output and Full Employment

The Keynesian model holds that the economy does not automatically self-correct to full employment. Key propositions include:

Aggregate Demand (AD) determines output: National income (Y) is determined by total spending — Consumption (C) + Investment (I) + Government Spending (G) + Net Exports (X–M).
Equilibrium Output: Equilibrium occurs where Aggregate Expenditure (AE) = National Income (Y), i.e., where the 45° line intersects the AE curve.

Y = C + I + G + (X – M)

Full Employment vs. Equilibrium: Keynes argued that equilibrium can occur below full employment. The economy may get stuck in underemployment equilibrium due to deficient aggregate demand — there is no automatic mechanism to restore full employment (contrary to classical economists).
The Multiplier: Any autonomous increase in investment or government spending raises income by a multiplied amount:

Multiplier (k) = 1 / (1 – MPC) = 1 / MPS

Policy implication: Government must use fiscal policy (increase G or cut taxes) to boost AD and move the economy to full employment.

(b) Inflationary and Deflationary Gaps

Deflationary (Recessionary) Gap:
Occurs when equilibrium output falls short of full employment output. Aggregate demand is insufficient.

Inflationary Gap:
Occurs when equilibrium output exceeds full employment output. Aggregate demand is excessive, pushing up prices.

Diagram:

AE (₦)        45°  
    |         /  
    |        /   AE₂ (Inflationary — too high)  
    |       / _-/  ← Inflationary Gap  
    |      /-/ AE₁ (Full Employment AE)  
    |     /  \← Deflationary Gap  
    |    /    AE₀ (Deflationary — too low)  
    |   /  
    |__/________________________________  
       Yₑ₀   Yf   Yₑ₂       Y (Output)  
  
Yf = Full employment output  
Yₑ₀ = Deflationary equilibrium (below Yf)  
Yₑ₂ = Inflationary equilibrium (above Yf)

Deflationary Gap = Yf – Yₑ₀ (shortfall in AE needed to reach full employment)
Inflationary Gap = Yₑ₂ – Yf (excess AE beyond full employment — causes inflation)
Remedy for deflationary gap: Expansionary fiscal/monetary policy.
Remedy for inflationary gap: Contractionary fiscal/monetary policy.

ECN 003: APPLIED ECONOMICS I

Question 5

Background: On 20th August 2019, Nigeria partially closed its land borders with Benin, Niger, and Cameroon, citing smuggling, insecurity, and economic reasons.

(a) Economic Implications for Nigeria

Positive Implications:

Boost to Domestic Production — With imports blocked (especially rice and other food items), local farmers and manufacturers were incentivised to produce more, supporting import substitution industrialisation.
Reduction in Smuggling — The closure curbed the smuggling of foreign rice (often subsidised), arms, and contraband that undermined Nigerian industries and government revenue.
Improved Customs Revenue — Less informal cross-border trade meant more formal trade through official channels, potentially increasing tariff collection.
Protection of Local Industries — Nigerian manufacturers in food processing, textiles, and agriculture were shielded from cheap foreign competition.

Negative Implications:

Inflation — The supply of goods fell sharply, causing the prices of essential commodities (rice, tomatoes, pepper) to spike, worsening the cost of living for ordinary Nigerians.
Disruption of Supply Chains — Many Nigerian businesses depended on raw materials and intermediate goods from neighbouring countries; the closure disrupted production.
Job Losses in Border Communities — Thousands of traders, transporters, and market women whose livelihoods depended on cross-border trade lost income.
Reduced Foreign Exchange Earnings — Re-export trade (a significant source of revenue for border communities) was halted.
Food Insecurity — Shortages of essential food items emerged, particularly in states near the border.

(b) Effect on Trade Relations with Neighbouring Countries

Diplomatic Tensions — ECOWAS neighbours, especially Benin Republic, formally protested the closure as a violation of the ECOWAS Free Trade Protocol, straining regional diplomatic ties.
Reduced Bilateral Trade — Trade volumes between Nigeria and its neighbours dropped sharply, damaging economic partnerships built over decades.
Regional Integration Setback — The closure undermined the ECOWAS vision of a borderless West Africa with free movement of goods, persons, and services.
Trust Deficit — Neighbouring countries lost confidence in Nigeria as a reliable trading partner, potentially driving them to forge stronger ties with non-Nigerian partners.

Question 6

(a) "Economic Growth is a Necessary but Not Sufficient Condition for Economic Development"

Definitions:

Economic Growth refers to a sustained increase in a country's real Gross Domestic Product (GDP) or per capita income over time. It is a quantitative concept.
Economic Development refers to a broader process of improvement in the quality of life of citizens — encompassing poverty reduction, better education, healthcare, equality, institutional quality, and human freedom. It is a qualitative concept.

Why Growth is Necessary:

Without economic growth, there are no additional resources to fund schools, hospitals, infrastructure, or poverty alleviation programmes.
Growth generates government revenue through taxes, which can finance development programmes.
Rising GDP per capita generally improves material living standards.

Why Growth is NOT Sufficient:

Unequal Distribution — A country may grow rapidly while wealth concentrates in the hands of a few (e.g., oil-rich Nigeria). GDP rises but the poor remain poor — this is growth without development.
Human Development Neglect — Growth can occur alongside poor health, illiteracy, and low life expectancy. Development requires improvement in the Human Development Index (HDI), not just GDP.
Environmental Degradation — Growth driven by resource extraction (e.g., oil, deforestation) may destroy the environment, reducing long-term welfare — a case of growth that undermines development.
Enclave Growth — Growth concentrated in one sector (e.g., oil in Nigeria) may not create broad-based employment or technological spillovers into the wider economy.
Political and Institutional Failure — Corrupt or weak institutions may divert growth proceeds into private pockets rather than public goods.

Conclusion: Development requires that growth is inclusive, equitable, and accompanied by improvements in human welfare, governance, and sustainability.

(b) Reasons for Nigeria's Persistent Balance of Payments Deficit

Nigeria's Balance of Payments (BOP) has consistently recorded deficits, particularly in the current account. Likely reasons include:

Over-dependence on Oil Exports — Nigeria's export earnings are overwhelmingly from crude oil. Any fall in global oil prices causes a sharp deterioration in the trade balance.
High Import Bill — Nigeria imports refined petroleum products (despite being an oil producer), machinery, food, and consumer goods — leading to massive import expenditure.
Weak Manufacturing Base — Nigeria's industrial sector is underdeveloped, forcing the country to import what it should produce domestically.
Capital Flight — Corrupt outflows and foreign investment repatriation of profits lead to large debits in the capital and financial account.
Debt Service Payments — Nigeria's large external debt requires significant foreign exchange for interest and principal repayments, worsening the BOP.
Exchange Rate Overvaluation — When the Naira is overvalued, imports become artificially cheap (stimulating imports) and exports become expensive (discouraging them).
Smuggling and Informal Trade — Unrecorded imports drain foreign exchange without appearing in official statistics, understating the true deficit.

ECN 004: APPLIED ECONOMICS II

Question 7

(a) Definition of Globalization

Globalization is the process of increasing interconnectedness and interdependence among countries of the world through the free flow of goods, services, capital, people, technology, and information across national borders, leading to the integration of national economies into a single global economy.

(b) Contributions of Globalization to Economic Development

Trade Expansion — Globalization opens markets, enabling countries to export more and specialise in goods where they have comparative advantage, increasing national income.
Foreign Direct Investment (FDI) — Multinational corporations invest in developing countries, bringing capital, technology, and employment opportunities.
Technology Transfer — Developing countries gain access to advanced technologies, improving productivity and industrial efficiency.
Employment Creation — Global firms establish factories and service centres in developing countries, creating millions of jobs (e.g., manufacturing in China, Bangladesh, and increasingly Nigeria).
Poverty Reduction — Increased trade and investment generate economic growth that, when well-managed, can lift populations out of poverty.
Access to Global Capital Markets — Developing countries can borrow from international financial markets to fund infrastructure and development programmes.
Cultural Exchange and Innovation — Cross-border interaction promotes innovation, knowledge sharing, and entrepreneurship.
Improved Governance — Integration into global institutions often pressures governments to adopt better regulatory, legal, and governance frameworks.

(c) Functions of the International Monetary Fund (IMF)

Surveillance — The IMF monitors the economic and financial policies of member countries and the global economy, identifying risks and recommending corrective policies.
Financial Assistance — The IMF provides loans (with conditions) to member countries experiencing BOP difficulties, helping them stabilise their economies (e.g., IMF loans to Nigeria in past decades).
Technical Assistance and Training — The IMF provides expertise and training to member governments in areas like tax policy, monetary policy, banking supervision, and statistics.
Promotion of Exchange Rate Stability — The IMF works to prevent competitive devaluations and maintain an orderly international monetary system.
Lender of Last Resort — For countries facing currency crises or severe BOP problems, the IMF acts as an emergency lender to prevent economic collapse.

Question 8

(a) Difference Between Economic Growth and Economic Development

Basis	Economic Growth	Economic Development
Nature	Quantitative	Qualitative
Meaning	Increase in real GDP/GNP	Improvement in overall well-being
Scope	Narrow (output-focused)	Broad (human-focused)
Measurement	GDP, GNP, Per Capita Income	HDI, poverty rate, literacy, life expectancy
Time Frame	Short to medium term	Long term
Sustainability	May not be sustainable	Aims to be sustainable
Applicability	Developed and developing countries	Primarily developing countries
Focus	Wealth creation	Wealth distribution + quality of life

In short: Growth is a means; development is the end. A country can grow without developing (e.g., oil-rich but poverty-stricken nations).

(b) Other Development Goals Beyond Economic Growth

Poverty Reduction and Eradication
Eliminating extreme poverty is a primary development goal. The UN Sustainable Development Goal 1 targets ending poverty in all forms. Development requires that the benefits of growth reach the poorest segments of society.
Human Capital Development (Education and Health)
Improving literacy rates, school enrolment, healthcare access, and life expectancy are central to development. Countries invest in education and health to build a productive workforce and improve welfare.
Reduction of Inequality
Development requires narrowing income gaps between the rich and poor (measured by the Gini Coefficient). High inequality undermines social cohesion and limits the benefits of growth to a minority.
Environmental Sustainability
Development must be achieved without destroying natural resources for future generations. Sustainable development balances economic goals with environmental protection — addressing climate change, deforestation, and pollution.
Political Freedom and Good Governance
Amartya Sen argued that freedom — civil liberties, political rights, rule of law — is both a means and an end of development. Countries with strong institutions, low corruption, and democratic governance achieve better development outcomes.
Gender Equality and Women's Empowerment
Closing gender gaps in education, employment, and political participation is a development priority. Countries that empower women grow faster and develop more equitably (SDG 5).
Infrastructure Development
Roads, electricity, clean water, sanitation, and telecommunications are prerequisites for productive economic activity and improved quality of life.
Food Security and Nutrition
Ensuring that all citizens have access to adequate, safe, and nutritious food (SDG 2 — Zero Hunger) is a fundamental development objective, especially in Nigeria where food insecurity remains a challenge.
Employment and Decent Work
Development requires not just jobs, but decent work — fair wages, safe conditions, and job security. Underemployment and informal sector dominance in Nigeria signal underdevelopment despite some GDP growth.
Social Justice and Human Rights
Development ultimately means expanding human capabilities and freedoms — the ability of every person to live a dignified, healthy, and fulfilling life, regardless of ethnicity, religion, or social class.

FreshNote

2022 JUPEB economics paper