The Assertion is false because Adam Smith argued that individuals pursuing their own self-interest could contribute to the wealth of society through the operation of market forces. He did not suggest that individuals should consciously sacrifice their self-interest. The Reason is true because microeconomic agents such as consumers and producers generally act to maximize their own utility and profit respectively. Therefore, Option D is the correct answer.

When the single representative-good model becomes too simplified, macroeconomics classifies production into three broad categories: agricultural goods, industrial goods and services. This allows economists to account for differences in production technologies and sectoral characteristics. Therefore, Option C is the correct answer.

1 → b : The household sector consumes goods and services, saves income and supplies labour and other factors of production. 2 → c : Capitalist firms hire factors of production and organize them to earn profit. 3 → a : The external sector deals with exports and imports. 4 → d : The government frames laws, imposes taxes and provides public services. Therefore, Option B is the correct answer.

The entrepreneur first arranges or borrows capital to finance production (1). The next step is hiring labour and acquiring land and other inputs (2). Production is then carried out and the finished goods are sold in the market (3). Finally, the revenue earned is used to pay rent, wages and interest, while the remaining amount is retained as profit for reinvestment (4). Therefore, the correct sequence is 1 → 2 → 3 → 4.

(1) is incorrect because capitalist production is primarily for the market rather than for family consumption. (2) is correct because private ownership of the means of production is a defining feature of capitalism. (3) is correct because labour services are purchased through wages. (4) is correct because firms produce goods and services mainly to earn profits through market sales. Therefore, Statements (2), (3) and (4) are correct, making Option C the correct answer.

General Equilibrium assumes that markets function efficiently and demand equals supply in every market. However, macroeconomics recognizes that governments may intervene to achieve social objectives such as employment, welfare and economic stability, even when markets fail. Therefore, Option B is the correct answer.

When a firm cannot sell its products at a sufficiently high price, its revenue declines while production costs may remain unchanged. As a result, the entrepreneur's profit decreases. This is a direct microeconomic consequence of market uncertainty. Therefore, Option A is the correct answer.

Entrepreneurs frequently use retained profits to purchase new machinery, construct factories and expand production capacity. Such spending is known as investment expenditure because it creates productive assets that contribute to future production and economic growth. Therefore, Option D is the correct answer.

The household sector purchases the goods and services produced by firms. This consumption demand enables firms to sell their output, earn revenue and continue production. Without household demand, the market for firms' products could not function effectively. Therefore, Option B is the correct answer.

The classical consumer-producer choice model is based on a capitalist market economy where individuals own property, produce for the market and make decisions to maximize utility or profit. In tribal societies, where land is collectively owned and production is primarily for community needs rather than market exchange, these assumptions do not apply. Therefore, Option A is the correct answer.

1 → c : During a depression, the general price level falls (deflation). 2 → a : Employment levels decline as firms reduce production. 3 → b : Aggregate output fell sharply during the Great Depression, including about a one-third decline in the USA. 4 → d : Inflation refers to a rapid increase in the general price level. Therefore, Option D is the correct answer.

Labour Force = 80 million + 20 million = 100 million Unemployment Rate = (20 ÷ 100) × 100 = 20% Therefore, the unemployment rate is 20%, making Option C the correct answer.

An open economy includes the external sector, which consists of exports and imports of goods and services. The inclusion of this sector distinguishes an open economy from a closed economy, where international trade is absent. Therefore, Option A is the correct answer.

The historical sequence begins with the Physiocrats in France (1), followed by Adam Smith's publication of The Wealth of Nations (2), which laid the foundation of classical economics. The Great Depression of 1929 then exposed the limitations of classical theory (3). In response, John Maynard Keynes published The General Theory of Employment, Interest and Money, establishing modern macroeconomics (4). Therefore, the correct sequence is 1 → 2 → 3 → 4.

Classical economists believed that markets would automatically adjust to achieve full employment. However, during the Great Depression, unemployment persisted for several years despite market forces. Classical theory failed to explain this prolonged aggregate unemployment, leading to the emergence of Keynesian macroeconomics. Therefore, Option C is the correct answer.

The Assertion is true because the Great Depression revealed serious weaknesses in classical economics and led economists to study the economy as a whole, giving rise to modern macroeconomics. The Reason is false because factories were not operating at full capacity during 1929–1933. Instead, many factories remained idle while unemployment reached exceptionally high levels. Therefore, Option B is the correct answer.

(1) is correct because reducing unemployment is an important macroeconomic objective. (2) is incorrect because governments generally seek to expand, not restrict, access to primary health care. (3) is correct because improving education contributes to economic development and human resource formation. (4) is correct because governments pursue welfare-oriented policies to improve living standards. Therefore, Statements (1), (3) and (4) are correct, making Option D the correct answer.

The government undertakes activities such as infrastructure development, public services and welfare programmes to improve the well-being of society. Unlike private entrepreneurs, whose primary objective is profit maximization, the State acts to promote public welfare, economic development and efficient administration. Therefore, Option A is the correct answer.

The passage highlights the collapse in demand, production and employment during the Great Depression. Keynes argued that government intervention was necessary to revive the economy. One of the primary fiscal policy tools available to the government is increasing public expenditure and modifying taxation policies to stimulate aggregate demand, output and employment. Therefore, Option B is the correct answer.

One important interdependent relationship in the economy is that households save a portion of their income and provide these savings to firms through financial institutions or capital markets. Firms use this capital for investment and, in return, households earn interest. This illustrates the monetary interdependence between the household and business sectors emphasized in macroeconomic analysis. Therefore, Option C is the correct answer.