Money is not just cash in your pocket. It is a complex stack of liquid assets held by individuals and financial institutions. Basically, the money supply includes coins, physical currency, and demand deposits such as checking accounts. These are funds you can use immediately to pay bills or buy groceries.
But the definition quickly becomes fuzzy.
Some economists argue that time deposits and savings deposits fall into this category. Why? Because governments can influence them through policy and they actively drive aggregate economic activity. They are almost as liquid as cash or checking deposits. Others go even further. They insist that deposits in mutual savings banks, savings and loan associations and credit unions must be taken into account. The logic is that these institutions have considerable capital flowing through the wider economy.
So who decides which assets count?
Central banks hold the hammer. In the United States, the Federal Reserve Board regulates the money supply. Across the Atlantic, the Bank of England plays a similar role in the UK. Their goal is stability. They want to prevent the economy from overheating or freezing.
They do this through monetary policy.
The Federal Reserve does not print money by hand. Instead, it buys or sells government securities. When the Fed buys securities, it pumps cash into the banking system. The money supply expands. When it sells them, the cash is withdrawn. Supply contracts. This leverage allows them to control interest rates and inflation without directly setting the prices of goods.
It’s a balancing act. Too much money chasing too few goods leads to inflation. Too little money slows down growth. The mechanics are precise, but the result is rarely simple.
You may be wondering which definition of money supply is most important to your wallet. The answer depends on what you want to predict. Short-term expenses are based on a narrow definition. Long-term investment trends often look at broader aggregates, including savings and credit institution deposits.
Central banks adjust the tap based on these metrics. When inflation accelerates, they tighten supply. When a recession looms, they loosen it. The tools are the same. Timing is everything.
Does this mean your checking account balance will increase when the Fed buys bonds? Not directly. The effects ripple through the system in ways that are difficult to track in real time. But there are pressures.
Understanding the money supply will help you know the water level before the flood hits. It does not tell exactly when the rain will start. But it will show you where the clouds are gathering.
