Most economies in the world are mixed economies, which means governments intervene in market operations when market failure occurs. Market failure happens due to either supply-side problems or demand-side problems. In simple terms, this means that markets do not always allocate resources efficiently on their own, and government intervention is sometimes needed to restore stability or fairness.
In economics, there is one graph that is necessary to understand: the aggregate demand–aggregate supply model, aka AD–AS model. It is a widely used macroeconomic model that explains short-run and long-run economic changes through the relationship of aggregate demand (AD) and aggregate supply (AS) in a diagram. Simply put, the AD–AS model shows how the total demand for goods and services in an economy interacts with the economy’s total production capacity to determine overall output and price levels. Because it connects economic activity, inflation, and growth in one framework, the model helps economists and policymakers understand why problems like inflation, unemployment, or recessions occur and how the economy reacts to different shocks or interventions. Even without deep economic knowledge, this model is useful because it visually explains how entire economies respond to changes in spending or production.
Now, when you know the relationship between aggregate demand and aggregate supply, the next question becomes how governments can influence it. In practice, policymakers cannot directly control the economy, but they can use specific tools to shift aggregate demand and stabilize economic fluctuations. These tools come in the form of economic policies—most notably fiscal policy and monetary policy—which are designed to manage demand-side problems by influencing spending, investment, and overall economic activity. These policies act as levers that governments and central banks pull when the economy overheats or slows down.
Solutions or actions governments implement to solve economic problems are called policies. Fiscal and Monetary policies are the main policies to resolve demand-side problems. They include tools that directly affect the Aggregate Demand of the economy. By increasing or decreasing overall spending, these policies help guide the economy toward stable growth.
For example, when AD is too low for the country’s products, many firms face excessive production, which forces them to release factor inputs such as labour and capital. This will eventually lead to increased unemployment and deflation (a general decrease in prices), which are the main indicators of economic recession.
And on the other hand, when AD is too high, inflation takes place. Prices increase while the rise in people’s income cannot catch up. This happens during economic booms when consumption rises more than proportionately to supply. Hence, competition for goods and services arises, and demand-pull inflation occurs (inflation that occurs when aggregate demand increases faster than aggregate supply, causing upward pressure on prices). Although economic growth may seem positive at first, uncontrolled inflation reduces purchasing power and economic stability.
In the previous situations, governments mainly implement either fiscal or monetary policy, if not both. Fiscal policy tools are government spending and taxation. There are two main types of fiscal policy: contractionary and expansionary, which aim to either decrease or increase AD, and hence prices.
Contractionary fiscal policy includes reduced government spending, so that less money is injected into the economy, so people will have less money to spend, or/and increased taxation, hence even more is taken out from people to spend. This leads to reduced spending, decreasing AD. Lower AD, as mentioned above, causes prices to fall, stabilizing inflation rates. Likewise, expansionary fiscal policy aims to help mitigate recession by injecting more money into the economy through increased government spending and reduced taxation. That encourages people to spend more on the goods produced in the country, which leads to the rise of the country’s GDP, improving AD.
Monetary policy, on the other hand, directly affects money in the economy. It is mainly controlled by the Central Bank (usually independent from the government), and it is usually faster and more technical than fiscal policy. However, similar to fiscal policy, there are two types of monetary policy: contractionary and expansionary. Central Banks try to adjust money supply, interest rates, credit availability, and sometimes exchange rates when implementing monetary policy. Because of its technical nature, monetary policy is often less visible to the public but highly influential.
Contractionary monetary policy is used to reduce AD and stabilize inflation rates. It’s achieved by decreasing the money supply, increasing interest rates, and making it hard to get credit. These changes will hinder consumption and decrease demand since people will have less money in their hands to spend, which will lead to lower general prices. On the other hand, expansionary monetary policy does the exact opposite to allow consumers take more money and spend it on products. This will raise AD and pull prices higher.
While these 2 policies seem effective and flawless, they have issues to consider. Fiscal policy takes longer to show its effects than monetary policy, but is more certain in its consequences. The right decision for most economies, however, is not to choose between them, but to find the correct mix of these two to make sure that the economy doesn’t suffer in the short run, waiting for the long-run effects. Hence, this is not a rivalrous decision, but an integration of different extents. This balanced approach helps stabilize the economy in the short run while supporting sustainable long-term growth.