Economics 2012 Jamb Examination

Economic growth primarily aims to improve the overall welfare of citizens by increasing income levels, employment opportunities, and access to goods and services. This leads to a higher standard of living, better healthcare, and improved education. While growth can also reduce poverty and redistribute income, these are secondary effects achieved through equitable policies and sustained growth. Hence, raising the standard of living is the most direct outcome of economic growth.

Soya beans have become a significant agricultural export crop in Nigeria due to increasing global demand for plant-based protein and oil. Nigeria’s favourable climate and government support for agricultural diversification have encouraged its large-scale cultivation. Other crops like cassava and cocoa are also exported but are more traditional export commodities, while soya beans are classified as emerging.

The income multiplier (k) is given by:\[ k = \dfrac{1}{1 - MPC} \]Substituting \( MPC = 0.75 \):\[ k = \dfrac{1}{1 - 0.75} = 4 \]Change in income = Multiplier × Change in investment\[ \text{Change in income} = 4 \times 2 = N8.0m \]This means an investment increase of N2 million leads to a total income increase of N8 million in the economy due to the multiplier effect.

The price index is calculated using:\[ \text{Price Index} = \dfrac{\text{Current Year Price}}{\text{Base Year Price}} \times 100 \]\[ = \dfrac{240}{120} \times 100 = 200 \]This means prices have doubled since the base year, representing a 100% increase in the general price level.

Commodity money refers to money that has intrinsic value — meaning its value as a commodity equals or exceeds its face value. Examples include gold coins and silver coins. The metal itself can be melted down and used, giving it a higher market value than its stated denomination. Paper and fiat money have no intrinsic value; their worth depends solely on government backing.

The cash reserve ratio (CRR) specifies the minimum fraction of customer deposits and notes that each commercial bank must hold as reserves (either in cash or with the central bank). This is a monetary policy tool used to control money supply, manage inflation, and ensure liquidity within the banking system.

The money market deals with short-term financial instruments such as treasury bills, certificates of deposit, and commercial papers. Its primary role is to provide liquidity to businesses, governments, and financial institutions that need funds for short-term operations, typically less than one year.

When input quantities are doubled but output increases by a smaller proportion, the firm experiences decreasing returns to scale. This typically occurs due to inefficiencies, poor coordination, or resource constraints that arise when a firm grows beyond its optimal operational size.

Patents and copyrights grant exclusive legal rights to produce or sell a product, preventing competitors from copying or entering the market. This legal barrier allows the holder to maintain monopoly power and control over pricing and production without immediate competition.

Price discrimination occurs when a monopolist charges different prices for the same product in different markets based on varying price elasticities of demand. In such a case, markets have different elasticities, allowing the monopolist to maximise total revenue by adjusting prices accordingly.