Exercises: Economic agents and the circular flow of income

Name the three main economic agents and explain in one sentence the role of each in the economy. Give an example of each taken from your everyday surroundings.

Distinguish between real flows and monetary flows, and classify the following: a checkout assistant's work, their salary, the purchase of a computer by a firm, and the bread bought by a household.

The figure shows the circular flow of income between households and firms, with four labelled flows.

1. a) Identify which flows are real and which are monetary.
2. b) Explain why the circuit can be viewed as a circle: where does the money "start" and where does it "end"?

What is the factors of production market within the circular flow? Explain who supplies and who demands labour in it, and give an example of a factor other than labour (rented premises, lent capital) with its corresponding market.

Topic challenge. The factors of production are labor, capital and land (or natural resources). Each one receives a different income: wages, interest or profits, and rent (or land rent).

1. a) Match each factor of production with the income that corresponds to it.

1. b) Give a real example, from your town or your surroundings, of each of these incomes (a wage, an interest or profit, and a rent).

What will be assessed: that the matching between factor and income is correct, and that each example is realistic and clearly corresponds to the factor of production it belongs to.

Distinguish consumption, investment and public spending within an economy's total spending, and classify: a household buys a washing machine, a bakery buys an industrial oven and the government builds a health centre. Which of the three increases future productive capacity?

What is the foreign sector in the circular flow? Explain how flows enter and leave a country's circuit through exports and imports, with an example of each (selling oranges abroad, buying oil abroad).

In the circuit, household saving is a "leakage" and firms' investment is an "injection". Explain what each term means using the analogy of a water circuit: where does the water leave and where does it come back in?

Two markets appear in the circular flow: the goods and services market and the factor market.

1. a) Explain who supplies and who demands in each of these markets.
2. b) Place in the corresponding market: renting premises, a payslip, and a supermarket purchase.

What role does the government play in the circuit? Explain where public money "enters" and "exits", mentioning taxes, public spending and public services.

Households in a country decide to save a much larger share of their income.

1. a) Explain what "leakage" the circuit suffers and what immediate effect it has on firms.
2. b) What "injection" could offset this leakage? Reason your answer.

Read this fictitious news item: "A German company opens a battery factory in Spain and will hire $200$ people from the local area".

1. a) Identify the economic agents that appear and the markets in which they interact.
2. b) Describe the real and monetary flows the news item generates (labour, wages, investment, products).

A household pays $400\ \text{€}$ a month in taxes and social security contributions, and receives public services valued at $520\ \text{€}$ (state school, healthcare, a school-meals grant).

1. a) Place these flows in the circuit: where does the household's money leave and where does it "come back"?
2. b) Explain what the example shows about redistribution within the circular flow.

Foreign tourists spend millions of euros every summer in a coastal area; the area's hotels import part of the food they serve.

1. a) Is tourist spending a leakage or an injection for the Spanish economy? Where does it enter the circuit?
2. b) And the food imported by the hotels? Explain how the two things partially offset each other.

A household buys a car made in Spain for $25.000\ \text{€}$, a significant part of which corresponds to imported components.

1. a) Trace which part of the price keeps circulating through the Spanish economy and which part leaves the circuit (leakage through imports).
2. b) Explain why it is in countries' interest for their products to have a high "domestic content".

Draw (or describe in detail) the circular flow of income with three agents: households, firms and the government.

1. a) What new arrows does the government add to the basic two-agent model (taxes, benefits, public purchases, services)?
2. b) Explain what happens to the size of the flow if the government collects a lot and spends little, or the other way round.

You can do it on paper and send a photo with your answer.

Ana earns $100\ \text{€}$ on her payslip for working at a butcher shop and spends it entirely at a local supermarket. The supermarket owner claims: "That money does not leave the economy: the $100\ \text{€}$ that the butcher shop paid in the factor market will turn entirely into wages for other workers in the next round, generating an infinite chain without any leakages".

1. a) Refute the owner's claim by modelling the journey of those $100\ \text{€}$ through the circular flow of income: identify the economic agents involved, the markets (goods and factor markets) they move through, and the correspondence between real and monetary flows.
2. b) Justify which decisions made by the agents introduce "leakages" into subsequent links of the chain, and interpret what would happen to local income and economic activity if consumers decided to divert that spending towards international e-commerce platforms.

The Government grants a subsidy of $5\ \text{million euros}$ to several film production companies to shoot movies in Spain. A political commentator claims: "That injection is a non-refundable waste of money; the money leaves public coffers and never returns to the State, nor does it revive the economy".

1. a) Refute this position by modelling how this injection is transmitted through the circular flow: identify which agents receive the funds in the first and second instance, which markets are stimulated, and how the multiplier effect operates on aggregate income.
2. b) Justify through which specific tax channels (leakages into the public sector) the State recovers part of that money, and predict how the impact on the circular flow would change if the production companies outsourced post-production to foreign firms instead of domestic ones.

During a recession, a country records a $4,5\,\%$ drop in its GDP, reflecting a notable decline in monetary exchanges within the circular flow. However, living conditions surveys show that the material well-being and consumption of many households barely deteriorated, thanks to an increase in unpaid domestic care and repairs, home vegetable gardens, and bartering of goods and services among neighbours.

1. a) Critically analyse this paradox based on the limitations of the traditional circular flow model: justify which real and factor transactions remain invisible when measuring the economy solely through monetary flows, and what risks are involved in designing public policies based exclusively on that measurement.
2. b) Design a conceptual or graphical adaptation proposal for the circular flow diagram that integrates both unpaid domestic work and informal activities, justifying how these flows relate to households and firms in the formal circuit.

A multinational corporation plans to invest $1.000.000\ \text{€}$ in building an industrial warehouse in a rural region. The impact assessment compares two candidate municipalities:

• In Municipality A, economic agents have a marginal propensity to consume locally of $75\,\%$ ($0,75$), allocating the remainder to bank savings and external purchases.

• In Municipality B, due to the lack of local shops and services, the marginal propensity to consume locally is only $30\,\%$ ($0,30$).

1. a) Apply the expenditure multiplier formula ($k = 1 / (1 - \text{MPC}_{\text{local}})$) to calculate the total impact on income that the initial injection will generate in each municipality, explaining through the circular flow why the final effect exceeds the initial spending.
2. b) Identify the three fundamental leakages that slow down the successive rounds of money in the circuit, and predict two specific measures that Municipality B could adopt to reduce these leakages and raise its multiplier without resorting to trade bans.

The main car plant in a region suddenly lays off $1.200$ workers, representing $25\,\%$ of local jobs.

1. a) Model the transmission of this shock through the circular flow of income: justify how a disruption originating in the factor market spreads to the goods and services market, generates a contractionary multiplier effect, and threatens to trigger a second wave of layoffs in indirect sectors (hospitality, retail).
2. b) To halt the collapse, two injections of public funds are considered: a hiring plan for municipal public works that will take six months to tender, or an extraordinary direct income transfer programme for the affected families available in two weeks. Compare both options: at which point of the circular flow is each one injected, what is their time lag, and which one would stabilise local consumption sooner? Justify your decision.

A city council must resolve a commercial conflict: authorize the opening of a large shopping center on the outskirts or grant subsidies for the modernization of small neighborhood shops. A technical report indicates that for every $100\ \text{€}$ spent in local shops, $60\ \text{€}$ are reinvested in the city itself (wages to residents, regional suppliers, local services), whereas in the shopping center only $18\ \text{€}$ are reinvested locally due to centralized purchasing and the transfer of profits to headquarters. In return, the shopping center offers prices that are $8\,\%$ lower.

1. a) Interpret these data using the concept of leakage in the circular flow and provide a reasoned justification for why the same volume of spending produces a very different multiplier effect on local employment and income in each model.
2. b) As the city council's economic advisor, write an assessment that weighs the dilemma between the dynamism of the local circular flow of income and the purchasing power of lower-income households. Justify what decision you would recommend making.

A fictitious economy presents the following annual macroeconomic data (in billions of euros):

• Private savings ($S$) = $200$

• Business investment ($I$) = $250$

• Net taxes ($T$) = $300$

• Government spending ($G$) = $280$

• Imports ($M$) = $150$

• Exports ($X$) = $100$

1. a) Classify the variables into leakages and injections of the circular flow, calculate the net balance between both, and make a reasoned prediction about the trend that national production (income) and the level of employment will experience if no exogenous changes occur.
2. b) In view of this situation, the Government proposes to increase government spending ($G$) up to $320\ \text{billion}$ to correct the gap, claiming that "the increase in economic activity will automatically balance the public deficit and the external sector." Critically evaluate this statement: calculate the State's new budget balance ($G - T$), the trade balance ($X - M$), and justify what macroeconomic imbalances would be accumulating in the circular flow.

A business representative argues in a debate: "The circular flow of income model demonstrates that GDP growth can be continuous and unlimited: one person's spending is another person's income, so the circuit can spin faster and faster without hitting any physical ceiling."

1. a) Refute this statement from the perspective of ecological economics: explain what biophysical inflows (natural resources, energy) and outflows (waste, emissions, dissipated heat) are omitted from the traditional closed diagram of the circular flow.
2. b) Justify why considering the circular flow as an isolated system can generate misleading signals in economic policy (for example, celebrating an increase in GDP resulting from an environmental catastrophe) and design a conceptual proposal to integrate the biophysical limits of the biosphere into basic economic analysis.