National Income And Related Aggregates

दोहरी गणना से बचने हेतु केवल अंतिम (final) वस्तुओं/सेवाओं का चालू अवधि का मूल्य वर्धन जोड़ा जाता है। मध्यवर्ती वस्तुएँ, पुरानी वस्तुओं का पुनः क्रय-विक्रय, तथा हस्तांतरण भुगतान राष्ट्रीय आय में नहीं जोड़े जाते।

GNP अवस्फीतिक (deflator) मूल्य स्तर का विस्तृत सूचकांक है: .

द्वि‑क्षेत्रीय मॉडल में दो इकाइयाँ हैं—परिवार और फर्में। परिवार कारक सेवाएँ (श्रम, भूमि, पूँजी) फर्मों को देते हैं; बदले में वेतन, किराया, ब्याज, लाभ के रूप में आय प्राप्त करते हैं। यही आय परिवार वस्तु‑बाज़ार में उपभोग व्यय के रूप में फर्मों को लौटाते हैं। इस प्रकार वास्तविक प्रवाह (कारक व वस्तुएँ) और मौद्रिक प्रवाह (आय व व्यय) विपरीत दिशाओं में निरंतर वृत्त बनाते हैं। यदि बचत/निवेश को शामिल करें तो परिवार बचत वित्तीय क्षेत्र को देते हैं और फर्में निवेश उधार लेती हैं; संतुलन की शर्त से बनती है। किसी भी असमानता पर आय समायोजित होकर नया संतुलन बनाती है। % Topic - circular flow (two-sector)

असत्य (3) है, क्योंकि प्रयोज्य आय का सही रूप वैयक्तिक आय से सीधे कर घटाकर प्राप्त होता है, न कि निजी (Private) आय से।

परिभाषा के शब्द किसी अर्थव्यवस्था के भीतर और बाजार मूल्य सीधे GDP at market prices की ओर संकेत करते हैं। GNP निवासियों द्वारा अर्जित, चाहे देश के भीतर या बाहर, का माप है; राष्ट्रीय आय factor cost पर शुद्ध आय का माप है।

सरल द्विक्षेत्रीय मॉडल में परिवार कारक सेवाएँ फर्मों को देते हैं और बदले में आय पाते हैं; यही आय वस्तु बाज़ार में उपभोग व्यय बनकर फर्मों को जाती है। यह धन प्रवाह और वस्तु प्रवाह निरंतर वृत्त बनाते हैं। तीन और चार‑क्षेत्रीय मॉडलों में सरकार और विदेशी क्षेत्र जुड़ते हैं, जहाँ लीकेज (बचत, कर, आयात) तथा इंजेक्शन (निवेश, सरकारी व्यय, निर्यात) संतुलन को तय करते हैं। यदि इंजेक्शन अधिक हों तो आय बढ़ती है, अन्यथा घटती है। बैंकिंग प्रणाली और वित्तीय बाज़ार इस प्रवाह को मध्यस्थता देकर प्रभावी बनाते हैं। यह ढांचा राष्ट्रीय आय की मापन विधियों और गुणक सिद्धान्त को समझने का आधार है।

क्षेत्रीय वर्गीकरण से संरचनात्मक परिवर्तन स्पष्ट होते हैं। प्राथमिक क्रियाएँ भूमि और प्राकृतिक उपहारों पर निर्भर हैं; मौसम, मानसून और भू-संपदा इनके निर्णायक कारक हैं। रोजगार सघनता अधिक पर उत्पादकता सामान्यतः कम रहती है। द्वितीयक क्षेत्र में कच्चा माल मशीनों और तकनीक से संसाधित होकर मूल्य‑वर्धित उत्पादों में बदलता है—उद्योग, निर्माण, बिजली‑गैस‑पानी आदि। यह क्षेत्र पूँजी‑गहन और कौशल‑आधारित होता है तथा शहरीकरण, निर्यात और आय वृद्धि को गति देता है। विकास के साथ श्रम प्राथमिक से द्वितीयक/तृतीयक की ओर शिफ्ट होता है, जिसे संरचनात्मक परिवर्तन कहा जाता है। नीतियाँ भी इसी परिवर्तन को प्रोत्साहित करती हैं ताकि उत्पादकता और आय स्तर बढ़े।

राष्ट्रीय आय लेखांकन में कारक भुगतान और हस्तांतरण अलग रखे जाते हैं। कारक भुगतान वर्तमान उत्पादन में लगे श्रम, पूँजी, भूमि और उद्यमिता के प्रतिफल हैं और मूल्य‑वर्धन का हिस्सा बनते हैं। इसके विपरीत हस्तांतरण भुगतान किसी वर्तमान उत्पादन के बदले नहीं दिए जाते, इसलिए वे GDP या NDP में सीधे नहीं जोड़े जाते। सरकार इन्हें सामाजिक सुरक्षा, असमानता कम करने, आय स्थिरीकरण और प्रोत्साहन नीतियों के लिए इस्तेमाल करती है। सब्सिडी मूल्य‑सहायता का रूप है; पेंशन और स्कॉलरशिप विशिष्ट समूहों को राहत देती हैं। लेखांकन में निजी और सरकारी दोनों प्रकार के हस्तांतरण होते हैं; पर अवधारणा समान रहती है—कोई नई वस्तु या सेवा इसके विरुद्ध प्रवाहित नहीं होती।

मापन क्रम समझें। राष्ट्रीय आय से निगमित आय कर, अप्रितरित लाभ आदि समायोजित कर और हस्तांतरण जोड़कर वैयक्तिक आय मिलती है; यह सभी व्यक्तियों द्वारा प्राप्त सकल आय है। इससे व्यक्तिगत प्रत्यक्ष कर तथा अनिवार्य अंशदान घटाएँ तो वैयक्तिक प्रयोज्य आय प्राप्त होती है। यही वह नकदी प्रवाह है जो परिवार उपभोग और बचत के बीच बाँटते हैं, इसलिए उपभोग फलन और गुणक विश्लेषण में यह प्रमुख चर है। नीति‑निर्माता कर दरों और हस्तांतरणों को बदलकर प्रयोज्य आय पर प्रभाव डालते हैं जिससे सामूहिक माँग नियंत्रित होती है। ध्यान दें कि प्रयोज्य आय निजी आय से नहीं, वैयक्तिक आय से निकाली जाती है।

स्थिर (आधार) कीमतों पर मापा गया GNP Real GNP—यह केवल उत्पाद की भौतिक मात्रा में परिवर्तन को दर्शाता है, मूल्य‑स्तर परिवर्तन के प्रभाव को हटाकर। चालू कीमतों पर मापा GNP Nominal/Money GNP।

उत्पादन (मूल्य वर्धन) विधि में अर्थव्यवस्था के सभी उत्पादन चरणों पर कुल मूल्य वर्धन जोड़ा जाता है। मूल्य वर्धन = उत्पादन का बाजार मूल्य − मध्यवर्ती उपभोग। इसके बाद आवश्यकतानुसार अप्रत्यक्ष कर घटा और अनुदान जोड़कर factor cost पर रूपांतरण किया जाता है, तथा अपमूल्यन घटाकर शुद्ध प्राप्त किया जाता है। मध्यवर्ती वस्तुओं को जोड़ने पर दोहरी गणना हो जाती।

स्टॉक वह परिमाण है जो किसी समय बिंदु पर मापा जाता है, जैसे संपत्ति, पूँजी भंडार, मुद्रा भंडार। फ्लो वह है जो समय अवधि में मापा जाता है, जैसे आय, निवेश, लाभ। इसलिए संपत्ति स्टॉक है जबकि आय, निवेश और लाभ फ्लो हैं।

समष्टि अर्थशास्त्र का फोकस सकल आय, रोजगार, मूल्य स्तर, निवेश, व्यापार चक्र जैसे समष्टि चर हैं। राष्ट्रीय आय का सिद्धान्त इन समष्टि चरों में सबसे मूल विषय है। उपभोग और उत्पादन के सूक्ष्म सिद्धान्त माइक्रो अर्थशास्त्र के क्षेत्र में चर्चा किए जाते हैं।

चार क्षेत्र हैं: परिवार, फर्म, सरकार, विदेशी क्षेत्र। संतुलन पर : यहाँ शुद्ध निर्यात है। यदि तो बाह्य माँग आय को बढ़ाती है; यदि तो यह घरेलू माँग का रिसाव है। किसी भी विचलन पर समायोजन तंत्र कीमत, आय और विनिमय दरों के माध्यम से काम करता है।

आर्थिक गतिविधियों का वर्गीकरण: प्राथमिक (कृषि, वानिकी, मत्स्य, खनन), द्वितीयक (उद्योग, निर्माण) और तृतीयक या सेवाएँ (परिवहन, संचार, बैंकिंग, पर्यटन, बीमा आदि)। इसलिए संचार तृतीयक क्षेत्र की गतिविधि है।

Open economy वह है जहाँ विदेश व्यापार/पूँजी प्रवाह की अनुमति होती है और मूल्य/आय का निर्धारण बाह्य क्षेत्र से प्रभावित होता है। (2) बंद अर्थव्यवस्था में विदेशी क्षेत्र अनुपस्थित माना जाता है।

Gregory King (17वीं शताब्दी के अंत) ने इंग्लैंड की राष्ट्रीय आय का प्रारम्भिक अनुमान दिया। बाद में कुजनेट्स ने आधुनिक सांख्यिकीय पद्धतियों से राष्ट्रीय लेखांकन को विकसित किया, पर पहला प्रयास किंग का माना जाता है।

Step 1: Understanding the law of variable proportion.
The law of variable proportion refers to the principle that when one factor of production (such as labor) is increased while other factors (such as capital) are kept constant, the output initially increases at an increasing rate but eventually begins to increase at a decreasing rate. This law is concerned with the relationship between variable and fixed inputs.

Step 2: Analyzing the options.
(A) Proportion between fixed and variable inputs: Correct. The law of variable proportion primarily deals with changes in the proportion between fixed and variable inputs.
(B) The ratio between marginal and average products: This is incorrect, as the law of variable proportion does not specifically focus on this ratio.
(C) The proportion between marginal and total products: This is incorrect. The law is focused on the relationship between inputs, not on this specific proportion.
(D) None of these: This is incorrect because the correct answer is (A) Proportion between fixed and variable inputs.

Step 3: Conclusion.
The correct answer is (A) Proportion between fixed and variable inputs, as the law of variable proportion is based on changes in the ratio of fixed to variable inputs.

Step 1: Understanding returns to scale.
Returns to scale describe how output changes in response to proportional changes in all inputs. If the increase in output is exactly proportional to the increase in inputs, this is called constant returns to scale.

Step 2: Analyzing the options.
(A) Increasing returns to scale: This would occur if output increases by more than the proportional increase in inputs. This is not the case here, as output increases in the same proportion as inputs.
(B) Decreasing returns to scale: This would occur if output increases by less than the proportional increase in inputs. This is also not the case here.
(C) Constant returns to scale: Correct. If all inputs are increased by a factor of t and output increases by exactly the same factor, this is constant returns to scale.
(D) None of these: This is incorrect because the correct answer is (C) Constant returns to scale.

Step 3: Conclusion.
The correct answer is (C) Constant returns to scale, as the output increases in the same proportion as the increase in inputs.

Step 1: Understanding the cost curves.
The marginal cost (MC) curve represents the additional cost incurred from producing one more unit of output. It is a key curve in understanding the production process. The average cost (AC) curve, on the other hand, represents the total cost per unit of output. The MC curve cuts the AC curve at its minimum point, which indicates the point of optimal production where the firm is most efficient in terms of cost per unit produced.

Step 2: Analyzing the options.
(A) Marginal cost curve cuts Total cost curve: This is incorrect. The MC curve does not cut the Total cost (TC) curve at its minimum point. Total cost does not have a minimum point.
(B) Marginal cost curve cuts Average cost curve: Correct. The MC curve cuts the AC curve at its minimum point. This is a key relationship in cost theory.
(C) Marginal cost curve cuts Fixed cost curve: This is incorrect. The FC curve is horizontal and does not have a minimum or maximum point. It does not intersect with the MC curve in this way.
(D) None of these: This is incorrect, as the correct answer is (B).

Step 3: Conclusion.
The marginal cost curve cuts the average cost curve at its minimum point. Therefore, the correct answer is (B) Marginal cost curve cuts Average cost curve.

Step 1: Understanding marginal output and inputs.
Marginal output refers to the additional output produced by using one more unit of input, while keeping other inputs constant. According to the law of increasing returns (in the short run), as more units of one input are used with other inputs constant, the marginal output initially increases.

Step 2: Analyzing the options.
(A) It decreases: This is incorrect. Typically, marginal output increases with increased input use in the short run, before it starts decreasing.
(B) It increases: Correct. As per the law of increasing returns, marginal output increases when more of one input is used, assuming other inputs are held constant.
(C) It remains constant: This is incorrect. Marginal output typically changes with the increase in input use.
(D) None of these: This is incorrect, as the correct answer is (B) It increases.

Step 3: Conclusion.
The correct answer is (B) It increases, as marginal output increases with the increase in the use of one input.

Step 1: Understanding isoquant curve.
An isoquant curve represents all the combinations of two inputs that produce the same level of output. It is similar to the indifference curve in consumer theory, but it applies to production, not consumption.

Step 2: Analyzing the options.
(A) Isoquant curve: Correct. An isoquant curve shows all possible combinations of two inputs that yield the same level of output.
(B) Indifference curve: This refers to a graph used in consumer theory to represent combinations of goods that give the same level of satisfaction.
(C) Isoscost curve: This refers to combinations of inputs that cost the same amount, which is not related to output levels.
(D) None of these: This is incorrect, as the correct answer is (A) Isoquant curve.

Step 3: Conclusion.
The correct answer is (A) Isoquant curve, as it represents combinations of inputs that produce the same level of output.

Step 1: Understanding the impact of exchange rate depreciation.
When the exchange rate of a country's currency depreciates, the value of its currency decreases relative to other currencies. This makes imported goods more expensive, which leads to a decrease in imports. On the other hand, exports become cheaper for foreign buyers, potentially increasing exports.

Step 2: Analyzing the options.
(A) Import: Correct. Depreciation of the currency makes imports more expensive, leading to a decrease in imports.
(B) Export: Incorrect. Depreciation typically makes exports cheaper for foreign buyers, which may increase exports.
(C) Capital investment: Incorrect. Exchange rate depreciation doesn't directly affect capital investment in a clear-cut way as it affects trade balance.
(D) None of these: Incorrect, as the correct answer is (A).

Step 3: Conclusion.
Exchange rate depreciation causes a decrease in imports, as they become more expensive. Thus, the correct answer is (A).

Government deficit and government debt are closely related economic concepts that reflect the financial condition of a government. Below is an explanation of their relationship:
Step 1: Understanding Government Deficit.
A government deficit occurs when the government’s expenditure exceeds its revenue in a given period. This shortfall must be financed by borrowing or other means. The deficit is usually expressed as the fiscal deficit, which includes both revenue and capital expenditure.

Step 2: Understanding Government Debt.
Government debt refers to the total amount of money the government owes to external and internal creditors. It is the cumulative result of all past borrowing, including the financing of previous deficits. Essentially, government debt represents the total amount of money the government has borrowed over time, including interest payments.

Step 3: Relationship between Deficit and Debt.
The relationship between government deficit and government debt is as follows:
- Deficit leads to Debt: When the government runs a deficit, it borrows money to cover the shortfall, which directly contributes to an increase in government debt.
- Cumulative Effect: Each year’s deficit adds to the total government debt. Thus, an ongoing deficit will continuously increase the total debt burden unless offset by surpluses in future years.
- Interest Payments: The government must pay interest on the accumulated debt, which further contributes to the deficit, creating a cycle.

Step 4: Implications for the Economy.
While running a deficit and accumulating debt can be sustainable in the short term, excessive and unmanageable debt can lead to financial instability and reduced ability to spend on other priorities. Governments must balance their budgets to avoid long-term debt crises.

Step 1: Understanding different types of economies.
An economy can be classified into various types based on the distribution and control of resources. In a mixed economy, both the private and public sectors coexist and share control over resources. The allocation of resources is designed to benefit the entire economy, including the pursuit of prosperity and happiness for all.

Step 2: Analyzing the options.
(A) Mixed economy: Correct. In a mixed economy, resources are allocated in such a way that they benefit the overall economy, including the happiness and well-being of its citizens.
(B) Centralised economy: In a centralised economy, the government controls the allocation of resources. While the government may aim for societal welfare, it does not focus on prosperity and happiness for the entire economy as a primary goal.
(C) Capitalist economy: In a capitalist economy, resources are allocated based on market forces, typically prioritizing profit rather than general well-being or happiness.
(D) None of these: This is incorrect, as the correct answer is (A).

Step 3: Conclusion.
The resources in a mixed economy are allocated to benefit the prosperity and happiness of the entire economy. Therefore, the correct answer is (A) Mixed economy.

Step 1: Understanding a capitalist economy.
In a capitalist economy, the means of production, such as factories, land, and machinery, are privately owned and operated for profit. The government does not control these activities, nor do the workers own them. The primary role is played by entrepreneurs who invest capital to organize production.

Step 2: Analyzing the options.
(A) Government: In a capitalist system, the government does not control production but rather acts as a regulator.
(B) Workers: While workers are involved in production, they do not own the means of production in a capitalist economy.
(C) Capitalist entrepreneurs: Correct. Capitalist entrepreneurs are the owners and organizers of production in a capitalist economy. They invest capital and manage the production process for profit.
(D) None of them: This is incorrect because option (C) is correct.

Step 3: Conclusion.
The correct answer is (C) Capitalist entrepreneurs, as they control production in a capitalist economy.

Step 1: Understanding the concept of optimum point.
The optimum point of a consumer is where they achieve the highest satisfaction with the available resources, represented by the tangency point between the budget line and an indifference curve. This point represents the most efficient allocation of resources.

Step 2: Analyzing the behavior of the budget line.
At the optimum point, the budget line is tangent to the highest indifference curve. This means that the budget line touches the indifference curve at exactly one point, indicating that the consumer has reached the best combination of goods they can afford.

Step 3: Analysis of options.
(A) Cuts: This option suggests that the budget line intersects the indifference curve at more than one point, which is not correct at the optimum point.
(B) Touches: Correct. At the optimum point, the budget line just touches the indifference curve without cutting it.
(C) Cuts two times: This option would indicate multiple intersections, which is not true for the optimum point.
(D) None of these: Incorrect, as the correct behavior is the budget line touching the indifference curve.

Step 4: Conclusion.
The budget line touches the indifference curve at the optimum point, meaning that the correct answer is (B) Touches.

Step 1: Understanding the demand curve.
The demand curve represents the relationship between the price of a good and the quantity demanded. Typically, as the price increases, the quantity demanded decreases, reflecting an inverse relationship. This inverse relationship leads to a downward-sloping demand curve.

Step 2: Understanding the slope.
The slope of the demand curve is negative, meaning it slopes downward from left to right. This indicates that as the price increases, the quantity demanded decreases, which is the law of demand.

Step 3: Analysis of options.
(A) Positive: A positive slope would suggest that as the price increases, the quantity demanded also increases, which is not the case in the law of demand.
(B) Negative: Correct. The slope of the demand curve is negative, meaning there is an inverse relationship between price and quantity demanded.
(C) Vertical: A vertical slope does not represent the typical behavior of the demand curve, which shows an inverse relationship between price and quantity demanded.
(D) None of these: Incorrect, as the correct answer is option (B).

Step 4: Conclusion.
The slope of the demand curve is negative, as it shows an inverse relationship between price and quantity demanded. Therefore, the correct answer is (B) Negative.

Banks provide loans to individuals through a well-defined process that ensures both the borrower and the bank are protected. Below are the main steps involved in the loan disbursement process:
Step 1: Loan Application.
The first step in obtaining a loan is to submit a loan application to the bank. This application typically includes personal information, income details, employment status, and the purpose of the loan. The applicant may need to provide documents such as identity proof, address proof, and income proof, depending on the type of loan.

Step 2: Credit Evaluation.
Once the application is submitted, the bank evaluates the borrower’s creditworthiness. This is done by reviewing the applicant’s credit score, financial history, and ability to repay the loan. Banks use this evaluation to assess the risk involved in lending money.

Step 3: Loan Approval and Terms.
If the applicant meets the bank’s criteria, the loan is approved. The bank then sets the terms of the loan, including the loan amount, interest rate, repayment schedule, and tenure. The terms are communicated to the borrower, who must agree to them before the loan is disbursed.

Step 4: Loan Disbursement.
After the terms are agreed upon, the loan is disbursed to the borrower. The disbursement can be in the form of a lump sum or as a series of installments, depending on the type of loan. For example, a home loan might be disbursed in phases, whereas a personal loan is usually given as a one-time amount.

Step 5: Repayment.
The borrower begins repaying the loan according to the agreed-upon schedule. The repayment includes both the principal amount and interest. The bank monitors the repayment and ensures that the borrower adheres to the schedule.

Price elasticity of demand (PED) measures the responsiveness of the quantity demanded of a good or service to a change in its price. It is defined as the percentage change in quantity demanded divided by the percentage change in price. Mathematically, it can be represented as: The significance of price elasticity lies in understanding how changes in price affect total revenue and demand. There are several types of price elasticity:

Step 1: Types of Price Elasticity.
- Elastic Demand (PED>1): When the percentage change in quantity demanded is greater than the percentage change in price. Consumers are highly responsive to price changes. For example, luxury goods often have elastic demand.
- Inelastic Demand (PED<1): When the percentage change in quantity demanded is less than the percentage change in price. Consumers are less responsive to price changes. Examples include basic necessities like salt or bread.
- Unitary Elastic Demand (PED = 1): When the percentage change in quantity demanded is exactly equal to the percentage change in price. In this case, total revenue remains unchanged.

Step 2: Factors Affecting Price Elasticity.
Several factors influence the price elasticity of demand, such as: - Availability of Substitutes: If substitutes are readily available, demand is more elastic.
- Necessity vs. Luxury: Necessities tend to have inelastic demand, while luxuries are more elastic.
- Time Period: Over time, demand tends to become more elastic as consumers find alternatives.
- Proportion of Income Spent: If a good takes up a large portion of a consumer's income, its demand is more elastic.

The transactionary demand for money refers to the demand for money for the purpose of carrying out transactions, such as buying goods and services. This type of demand is influenced by the level of income and the frequency of transactions in an economy. The equation for the transactionary demand for money is given as: where: - is the transactionary demand for money,
- is the national income or output,
- is a constant that represents the proportion of income held in the form of money for transaction purposes.

Step 1: Income and Transactions.
The transactionary demand for money is directly related to the level of national income, as higher income levels lead to more transactions and, therefore, a greater demand for money to carry out these transactions.

Step 2: Determining the Constant .
The constant is determined by factors such as the velocity of money and the frequency of transactions in the economy. It represents how much money people want to hold for transactions relative to their income. The value of can vary depending on the economic conditions and cultural habits of the people.

Step 3: Implications of the Equation.
The equation shows that as national income increases, the transactionary demand for money increases proportionally. This is because higher income leads to more goods and services being bought, requiring more money to facilitate these transactions. Conversely, if income falls, transactionary demand for money will decrease.

A demand deposit is a type of bank account from which funds can be withdrawn at any time without any prior notice. These deposits are highly liquid and are typically used for daily transactions. The most common examples of demand deposits are checking accounts or current accounts.
Step 1: Characteristics of Demand Deposit.
- No Withdrawal Restrictions: Funds in a demand deposit can be withdrawn at any time by the account holder without any penalty or advance notice.
- Check or Debit Facilities: Demand deposits often come with the option to write checks or use debit cards for transactions.
- No Interest: Generally, demand deposits do not earn interest or offer minimal interest compared to savings accounts.

Step 2: Use of Demand Deposit.
Demand deposits are primarily used by individuals and businesses for everyday transactions. The ease of withdrawal and the lack of restrictions make them a convenient choice for holding money for daily expenses.

Step 1: Understanding total revenue and total cost.
The total revenue (TR) of a firm is the total income it earns from the sale of goods or services. Total cost (TC) is the total expenditure incurred in the production process. The difference between total revenue and total cost represents the firm's profit (or loss) from its business operations.

Step 2: Analyzing the options.
(A) Marginal cost: This is incorrect. Marginal cost refers to the additional cost of producing one more unit and is not the difference between total revenue and total cost.
(B) Average variable cost: This is incorrect. Average variable cost is the variable cost per unit of output, not the difference between total revenue and total cost.
(C) Minimum average cost: This is incorrect. The minimum average cost refers to the lowest point on the average cost curve, not the difference between total revenue and total cost.
(D) Profit: Correct. The difference between total revenue and total cost is the firm's profit.

Step 3: Conclusion.
The difference between total revenue and total cost is the firm's profit. Therefore, the correct answer is (D) Profit.

Step 1: Understanding cost curves.
The marginal cost (MC) curve and average cost (AC) curve typically have an inverted 'U' shape, meaning they first decline and then rise as output increases. This shape reflects economies of scale at lower levels of output and diseconomies of scale at higher levels of output.

Step 2: Analyzing the options.
(A) Inverted 'U' shaped: Correct. Both the marginal cost curve and average cost curve typically have this shape in the short run.
(B) Parallel to x-axis: This is incorrect because cost curves do not run parallel to the x-axis. They typically have a U-shape or inverted U-shape.
(C) Inverted 'S' shaped: This is incorrect, as the typical cost curves are not shaped like an 'S'.
(D) None of these: This is incorrect because the correct answer is (A) Inverted 'U' shaped.

Step 3: Conclusion.
The correct answer is (A) Inverted 'U' shaped, as both the marginal cost and average cost curves generally follow this pattern.