Stocks and flows

Correct answer: C. During a period

Explanation: A flow is measured over an interval, so “during a period” is the most suitable expression. Income, expenditure, production, and investment are flows because they occur through time. “On a date,” “today,” and “at year end” generally identify a point-in-time stock or balance.

Correct answer: A. A stock is measured at a specific point of time, whereas a flow is measured over a period of time

Explanation: The fundamental distinction is the time dimension of measurement. A stock is measured at a particular instant, such as wealth or debt on 31 March. A flow is measured across an interval, such as income, expenditure, or production during a year. The other statements wrongly restrict the concepts or make an unsupported numerical claim.

Correct answer: A. Stock and flow

Explanation: Cash balance today is the amount held at a particular point in time, so it is a stock. Expenditure during the week is the total spending accumulated over a specified interval, so it is a flow. The fact that both are expressed in money does not make them the same type; the measurement period determines the classification.

Correct answer: A. Stock and flow

Explanation: Accounts receivable on a particular date represents the amount outstanding at one point in time, so it is a stock. Credit sales during the year represent transactions accumulated over a period, so they are a flow. The words “on a date” indicate a stock, while “during the year” indicates a flow. Therefore, option A is correct.

Correct answer: B. Flow and stock

Explanation: Government borrowing during the year is measured over a time interval and records a transaction occurring during that period; therefore, it is a flow. Total government debt at the end of the year is the accumulated outstanding liability at one specific date, so it is a stock. Hence the correct order is flow and stock, option B.

Correct answer: C. Stock and flow

Explanation: Money supply means the quantity of money existing and available in the economy at a particular point in time, so it is a stock variable. New money creation refers to the amount added during a specified period, such as a year, and is therefore a flow. Thus, the correct classification is stock and flow, option C.

Correct answer: B. Stock and flow

Explanation: Outstanding share capital at the end of the year is the accumulated value existing on a particular date, so it is a stock. The value of new shares issued during the year records an addition occurring over a period, so it is a flow. The first quantity is therefore a stock and the second is a flow. Hence, option B is correct.

Correct answer: A. Bank balance on a date

Explanation: A bank balance on a particular date shows the amount held at one point in time. It is therefore a stock, not a flow. Interest earned during a month, sales during a year, and output produced during a week are all measured over intervals of time and are flows. The date-based bank balance is the only correct exception, so option A is correct.

Correct answer: C. Monthly consumption expenditure

Explanation: Monthly consumption expenditure is the total spending incurred throughout one month. Because it is measured over a period, it is a flow rather than a stock. Wealth at year end, debt today, and capital on a particular date are measured at specific points in time and are stocks. Therefore, option C is the only correct answer.

Correct answer: A. Stock and flow

Explanation: The number of books the student has today is measured at one particular point in time, so it is a stock. The number of books bought during the year counts acquisitions occurring over a period, so it is a flow. The example illustrates that even a physical quantity can be classified by its time reference.

Correct answer: B. Stock and flow

Explanation: The number of hospital beds available on a particular day describes capacity existing at one point in time, so it is a stock. The number of patients admitted during a month counts events occurring throughout a time interval, so it is a flow. Since the order is stock followed by flow, option B is correct.

Correct answer: A. Flow and stock

Explanation: Debt repayment during the year records payments made over a period, so it is a flow. Debt outstanding at the end of the year represents the remaining liability on one specific date, so it is a stock. The repayment may reduce the debt stock, but the repayment amount itself is still a flow. Therefore, the correct order is flow and stock, option A.

Correct answer: A. Flow and stock

Explanation: Annual sales measure the value of transactions completed throughout an entire year, so sales are a flow. Accounts receivable at year end measures the unpaid amount outstanding on one particular date, so it is a stock. The time expressions identify the classification: “annual” indicates a period, while “at year end” indicates a point in time. Hence, option A is correct.

Correct answer: B. Goods in warehouse today stock and withdrawals during the day flow

Explanation: The goods stored in a warehouse today represent the quantity existing at a particular point in time, so they are a stock. Withdrawals during the day count movements or transactions occurring throughout a period, so they are a flow. The correct order is therefore stock and flow. Option B accurately applies the time-based definitions.

Correct answer: D. Check whether measurement refers to a date or a period

Explanation: The most reliable test is the time dimension. A stock is measured at a particular point, such as wealth on 31 March, whereas a flow is measured over a period, such as income earned during a year. The size, name, or government ownership of an item does not determine its classification. Therefore, option D is correct.

Correct answer: A. Flow and stock

Explanation: Borrowing during the year is measured over a specified period, from the beginning to the end of the year. Therefore, it is a flow variable. Total external debt at the end of the year represents the accumulated outstanding liability at one particular point in time, so it is a stock variable. The correct order is therefore flow and stock, as stated in option A. This distinction is important because flows change stocks over time.

Correct answer: C. Stock and flow

Explanation: The value of machinery at year-end is measured on a particular date and represents the capital asset held at that time; it is therefore a stock. Depreciation during the year measures the loss in value over a period and is therefore a flow. Hence, option C gives the correct order.

Correct answer: A. Stock

Explanation: Opening capital stock is the value of machines, buildings, and other capital assets available at the beginning of a specified year. Since it is measured at one point in time rather than over the whole year, it is a stock variable. Net investment, in contrast, is measured during the year and is a flow.

Correct answer: B. Flow

Explanation: Net investment during the year measures the addition to, or change in, the capital stock over a particular period. Since it is recorded for the whole year, it is a flow variable. A capital stock or accumulated wealth, in contrast, is measured at a particular point in time and is therefore a stock. The phrase “during the year” is the key clue. Hence, option B is correct.

Correct answer: B. National income is a flow and national wealth is a stock

Explanation: National income is the income generated or earned during a specified period, such as a year, so it is a flow. National wealth is the accumulated value of assets owned by a nation and measured at a particular date, so it is a stock. Therefore, option B correctly distinguishes them.

Correct answer: C. Cash in hand at the end of the day

Explanation: Cash in hand at the end of the day states the amount available at one specified point in time, so it is a stock. Cash sales, receipts, and withdrawals during a month, year, or week are transactions accumulated over periods and are therefore flows. Hence, option C is the correct answer.

Correct answer: D. Cash receipts during a month

Explanation: Cash receipts during a month are measured by adding all receipts that occur throughout that specified period, so they constitute a flow. A cash balance today, on a date, or at year-end is an amount existing at one point in time and is therefore a stock. Thus, option D is correct.

Correct answer: A. Stock and flow

Explanation: A company’s net worth on a particular date is the value of its assets minus its liabilities at that point in time. Because it describes a position on a date, it is a stock variable. Annual profit is calculated from revenue and expenses earned or incurred throughout the year, so it is measured over a period and is a flow variable. Thus, the correct order is stock and flow, given in option A.

Correct answer: B. Stock

Explanation: Production capacity on a specified date represents the maximum productive capability available at that point in time. It is a position or existing capacity, not the quantity actually produced over a period. Therefore, it is a stock variable. Actual output during a year would be a flow, so option B is correct.

Correct answer: C. Flow

Explanation: Annual output is the quantity or value of goods produced throughout one year. Because it is measured over a specified period rather than at one particular moment, it is a flow variable. A factory’s capacity or inventory on a particular date would be a stock, but annual production is correctly classified as a flow; therefore, option C is correct.