Here is a very interesting and very relevant explanation of how M2 has an impact on inflation, which from the description is pretty much what has happened over the last few years.
The relationship between M2 (the broader measure of the money supply) and inflation is rooted in basic economic principles of supply and demand, monetary theory, and the velocity of money. Here’s a detailed breakdown of how M2 can influence inflation:
1. Basic Money Supply and Demand
The quantity theory of money provides a foundational explanation for the relationship between the money supply and inflation. It can be expressed as:
MV=PQ
Where:
M is the money supply (including M2),
V is the velocity of money (the rate at which money is exchanged from one transaction to another),
P is the price level,
Q is the output of goods and services produced by the economy.
According to this theory, if the money supply (M) increases faster than real economic output (Q), then either the velocity of money (V) must decrease or the price level (P) must increase. Historically, the velocity of money is relatively stable in the short run, so increases in the money supply typically lead to increases in the price level — in other words, inflation.
2. Increased Consumer Spending
As M2 expands, it indicates more money is available in the economy, not just in liquid forms (like cash and checking accounts), but also in slightly less liquid forms like savings accounts and money market funds. This availability can lead to increased consumer spending. When consumers have more money, their demand for goods and services tends to increase. If supply doesn't rise to meet this increased demand, prices will likely increase, leading to inflation.
3. Expectations and Wage-Price Spirals
The expectation of inflation itself can be a driver of inflation. If businesses expect future price increases, they may raise prices preemptively. Similarly, if workers expect inflation, they may demand higher wages, which businesses then pass on to consumers in the form of higher prices, creating a wage-price spiral. An expanding M2 can fuel these inflationary expectations if market participants believe that it signifies an ongoing increase in the money available to spend.
4. Impact on Interest Rates
As discussed earlier, an expansion in M2 typically leads to lower interest rates. While initially, this may boost economic activity, over the long term, lower interest rates can increase inflationary pressures. This is because cheaper credit allows more spending and investing, pushing up demand. Again, if supply does not keep pace, the result is higher prices.
5. Velocity of Money
The velocity of money (V) also plays a critical role. If M2 increases but the velocity of money does not decrease (i.e., money keeps changing hands quickly), the effect on inflation could be pronounced. However, if the velocity of money falls, it might offset some inflationary pressures from an increasing M2. Post-2008 financial crisis data in many economies showed a substantial increase in M2 without corresponding inflation, partly because the velocity of money declined significantly.
6. Central Bank Policies
Central banks monitor M2 and other monetary aggregates to adjust their policies. If they perceive too much inflationary pressure from an expanding money supply, they may take steps to tighten the monetary conditions, such as raising interest rates or selling off assets to reduce the money supply.
Conclusion
Thus, M2 affects inflation primarily through its influence on the amount of money circulating in the economy and its impact on spending, interest rates, and economic expectations. Central banks carefully watch these dynamics to manage inflationary pressures effectively.