Consider the distinction between “stock” and “flow” variables. Which of the following variables are ALL “flow” variables?Group of answer choicesInvestment, savings, wealthGDP, investment, wealthInvestment, savings, capitalGDP, investment, consumption
Question
Consider the distinction between “stock” and “flow” variables. Which of the following variables are ALL “flow” variables?Group of answer choicesInvestment, savings, wealthGDP, investment, wealthInvestment, savings, capitalGDP, investment, consumption
Solution
The correct answer is "GDP, investment, consumption".
Here's why:
A "flow" variable is measured over an interval of time. Therefore, it represents a rate of change. Examples of flow variables include income, consumption, and investment, which are all measured per unit of time (such as a year or a quarter).
On the other hand, a "stock" variable is measured at a specific point in time, and it represents a quantity. Examples of stock variables include wealth and capital, which are accumulated results of past activities.
So, let's look at the options:
- Investment, savings, wealth: Wealth is a stock variable, not a flow variable.
- GDP, investment, wealth: Wealth is a stock variable, not a flow variable.
- Investment, savings, capital: Capital is a stock variable, not a flow variable.
- GDP, investment, consumption: All of these are flow variables.
Therefore, the correct answer is "GDP, investment, consumption".
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