Microeconomics vs. Macroeconomics: What's the Difference?

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Microeconomics vs. macroeconomics comes down to scale. Microeconomics studies how individual people, households and businesses decide how to use scarce resources, and how those decisions set the prices and quantities of particular goods, services and jobs. Macroeconomics studies the economy as a whole: total output (GDP), the overall price level and inflation, unemployment, interest rates, trade and growth, along with the government and central bank policies that influence them. Micro works from the bottom up. Macro works from the top down. Both describe the same economy, so a change at one level usually shows up at the other.

What microeconomics studies

Microeconomics asks how people and businesses allocate limited resources and at what prices they trade. Its subjects include a household deciding how to split a budget, a company choosing how much to produce and what to charge, and a worker weighing one job offer against another. It also covers how taxes, regulations and legislation change those choices. A sales tax on one product, for example, alters what buyers pay and what sellers keep.

Core ideas in microeconomics include:

• Supply, demand and equilibrium. Prices move toward the point where the quantity buyers want equals the quantity sellers offer. In a perfectly competitive market, that point is the equilibrium price.
• Production theory. This covers how firms turn inputs such as labor, materials and machinery into goods and services, and how they can expand output or capacity to lower prices and compete.
• Costs of production. Under this approach, what a good costs to make shapes the price it sells for.
• Labor economics. This studies workers and employers to explain patterns in wages, employment and income.

What macroeconomics studies

Macroeconomics treats a country, or the world economy, as a single system. It tries to answer questions like “What rate of inflation should a country aim for?”, “What drives economic growth?” and “Why does unemployment rise in a recession?”

Its central measure is gross domestic product, the total value of what an economy produces. Macroeconomics examines how GDP relates to unemployment, income, growth and the price level, and how net exports and capital flows link one economy to others. Measuring output properly means separating growth in quantity from growth in prices, which is the distinction behind real vs. nominal GDP.

Governments use macroeconomics to set policy. Central banks adjust interest rates and the money supply, and legislatures decide on taxes and spending. The two levers work differently, as covered in monetary policy vs. fiscal policy.

How the two levels connect

The two fields are not separate economies. Macro totals are the sum of micro decisions. GDP is what millions of households and firms buy and produce. The unemployment rate is the result of countless individual hiring and job-search decisions. The inflation rate summarizes price changes set in many separate markets.

The influence runs the other way too. When a central bank raises interest rates, a macro decision, it changes micro choices. A family delays buying a house, a company postpones building a factory, and a retailer reconsiders how much inventory to carry on credit.

Adding up individual behavior does not always give an intuitive total, which is why macroeconomics exists as its own field. A standard illustration is the paradox of thrift. For one household, saving more during hard times is prudent. If every household cuts spending at the same moment, though, businesses sell less, lay off workers, and total income can fall. Each choice made sense on its own, and the combined result was a weaker economy.

Example: one market, two lenses

Suppose, as a hypothetical example, that a drought sharply reduces a country’s wheat harvest.

The micro questions:

• How much does the price of wheat rise as supply falls while demand stays roughly the same?
• Does a bakery absorb the higher flour cost, raise bread prices, or shrink its loaf size?
• Do consumers switch from bread to rice or potatoes, and how sensitive is their demand to price?
• Do farmers with irrigation gain market share from those without it?

The macro questions:

• Does the jump in food prices lift the overall inflation rate, and by how much?
• Does lower farm output reduce GDP or raise unemployment in farming regions?
• Does the country import more wheat, worsening its trade balance?
• Should the central bank respond to the higher inflation reading, or treat it as a temporary supply shock?

The cause is the same in both cases. What changes is the unit of analysis: one market and its participants, or the national economy and its policymakers.

Where the line blurs

Several common topics belong to both fields. How they are classified depends on how the question is framed.

Price. Asking why the price of wheat rose relative to other goods is micro. Asking why prices across the whole economy are rising, which is inflation, is macro. Historical inflation figures, such as those in U.S. inflation rate by year, are macro data even though every reading is built from individual prices.

Scarcity. Scarcity is the starting premise of all economics. Micro applies it to a person’s budget or a firm’s resources. Macro applies it to a nation’s total labor, capital and output capacity.

Equilibrium. Micro studies equilibrium in a single market, where supply meets demand. Macro uses a similar idea for the whole economy, such as the balance between aggregate demand and aggregate supply.

Policy. A minimum wage law is set by government, yet its effect on hiring at a particular kind of business is a micro question. Its effect on total employment and incomes is a macro one.

A good test is to ask whether the question is about one decision-maker or market, or about a total for the whole economy. If it is a total, it is macro.

What the distinction means for investors

Micro and macro forces reach a portfolio through different channels. Micro factors are more likely to move an individual stock. Macro factors can push many holdings in the same direction at once.

Micro: valuing a company

Supply and demand affect stock prices in two ways. The direct effect is in the market for the shares themselves. When more investors want to buy a stock than want to sell it at the current price, the price rises. When sellers outnumber buyers, it falls.

The indirect effect comes through demand for the company’s products. Strong demand can support rising earnings and, often, a higher share price. Weak demand, excess inventory or oversupply in its industry can lead to disappointing earnings and a falling stock. Taxes and regulations that change a company’s costs or pricing power also fall in this micro category.

Some well-known value investors have said they focus almost entirely on this level. Warren Buffett said that he and his partner Charlie Munger did not pay attention to macroeconomic forecasts, and that over decades of working together he could not recall a stock decision in which macro came up. He has also mocked macroeconomic commentary as “the funny papers.” John Templeton told Forbes in 1978 that he never asked whether the market would rise or fall because he did not know and it did not matter. His method was to look across countries for the stock priced lowest relative to his estimate of its worth.

Macro: the tide under every holding

Ignoring macro forecasts in stock picking is different from being unaffected by macro events. The 2008 to 2009 Great Recession and market crash followed the collapse of the U.S. housing bubble and the near-failure of financial institutions heavily exposed to subprime mortgages. Diversification across sectors offered limited protection because the shock was economy-wide.

The spring 2020 pandemic crash showed the effect in reverse. Governments and central banks responded with large fiscal and monetary stimulus to support their economies. That flood of liquidity contributed to a strong market recovery, with many major equity indexes reaching record highs in the second half of 2020 and through much of 2021.

Interest rates are the most direct macro channel for many investors. Bonds and other rate-sensitive securities react to central bank decisions and to the fiscal outlook, so holders of those assets have more reason than most to follow monetary and fiscal policy.

Global macro strategy

At the far end of the spectrum, a global macro strategy builds positions mainly around large national or international developments, such as interest rates, currency levels, political events and relations between countries. It expresses those views through currencies, bonds, equity indexes and commodities, close to the opposite of Buffett’s company-by-company approach.

The Bottom Line

Students, policy watchers and investors all benefit from knowing which lens a question needs. Company-level supply, demand and costs tend to drive individual stocks, while economy-wide shocks such as the 2008 crash or the 2020 stimulus can move many holdings at once. Investors who pick stocks can focus on company fundamentals, but bond holders and anyone with rate-sensitive assets have strong reason to follow monetary and fiscal policy.