13-Week Money Supply Grows by 3.7% Following Seasonal Trend | SchiffGold

Money Supply is a very important indicator. It helps show how tight or loose current monetary conditions are regardless of what the Fed is doing with interest rates. Even if the Fed is tight, if Money Supply is increasing, it has an inflationary effect. 

One key metric shown below is the “Wenzel” 13-week annualized money supply figure. It was made popular by the late Robert Wenzel who tracked the metric weekly as an indicator for where the economy might be headed. In 2020, the Fed started reporting the data monthly instead of weekly. It should also be noted that Money Supply data can be heavily revised in future months. 

Recent Trends 

Seasonally Adjusted Money Supply has been growing on a consistent monthly basis since January 2024. The latest month (August) showed another solid increase of $80B. This continues the trend of elevated money supply growth. 

Figure: 1 MoM M2 Change (Seasonally Adjusted) 

The increase was 4.4% annualized, which is below the 4.8% over the past year. 

Figure: 2 M2 Growth Rates 

August average is typically around 6.5%, which puts the latest month below average. 

Figure: 3 Average Monthly Growth Rates 

Non-seasonally adjusted shows positive growth for the month of August and September (note: this data is ahead of the seasonally adjusted data). 

The weekly data shows what happened. There was a decent pop in the first week of September. 

Figure: 4 WoW M2 Change 

The “Wenzel” 13-week Money Supply 

The late Robert Wenzel of Economic Policy Journal used a modified calculation to track Money Supply. He used a trailing 13-week average growth rate annualized as defined in his book The Fed Flunks. He specifically used the weekly data that was not seasonally adjusted. His analogy was that in order to know what to wear outside, he wants to know the current weather, not temperatures that have been averaged throughout the year. 

The objective of the 13-week average is to smooth some of the choppy data without bringing in too much history that could blind someone from seeing what’s in front of them. The 13-week average growth rate can be seen in the table below. 

Growth has started to pick back up again after a slight deceleration through the summer months. Over 7 weeks, money supply growth went from 5.16% to 3.19% before accelerating back up to 3.7%. 

Figure: 5 WoW Trailing 13-week Average Money Supply Growth 

The plot below shows how this year compares with previous years. This year has started at about the average point over the last 10 years. Growth typically bottoms in August before picking back up to close out the year. the trend this year is almost exactly in the middle of all past trends. It has been almost exactly average on the year. 

Figure: 6 Yearly 13-week Overlay 

Inflation and Money Supply 

The chart below shows the history of inflation, Money Supply, and Fed Funds. As shown, in 1970 inflation worked with ~2-year lag compared to Money Supply. Money Supply slowed dramatically in 2023 and 2024 but has been moving back up. Inflation has also been stickier than the Fed would like, but unfortunately, they cannot do much given the large debt load of the US Government and Corporations. 

Figure: 9 YoY M2 Change with CPI and Fed Funds 

Historical Perspective 

The charts below are designed to put the current trends into historical perspective. The orange bars represent annualized percentage change rather than raw dollar amount. 

Figure: 8 M2 with Growth Rate 

Below shows the 13-week annualized average over history. This chart overlays the log return of the S&P. Mr. Wenzel proposed that large drops in Money Supply could be a sign of stock market pullbacks. His theory, derived from Murray Rothbard, states that when the market experiences a shrinking growth rate of Money Supply (or even negative) it can create liquidity issues in the stock market, leading to a sell off. 

While not a perfect predictive tool, many of the dips in Money Supply precede market dips. Specifically, the major dips in 2002 and 2008 from +10% down to 0%. 2022 was highly correlated with a fall in Money Supply and the rebound has corresponded with the big stock market move we saw in 2023 and into 2024. The slowing growth in 2025 did correlate with the market drop in March/April, but that was clearly more headline driven. 

Please note the chart only shows market data through Sep 1st to align with available M2 data. 

Figure: 9 13-week M2 Annualized and S&P 500 

One other consideration is the reverse repo market at the Fed. This is a tool that allows financial institutions to swap cash for instruments on the Fed balance sheet. 

Reverse Repos peaked at $2.55T on Dec 30, 2022. Money gushed out from March 2023 to May 2024. The outflows have taken another leg down as the remaining balances have been drained. This is the lowest level since 2021, now standing at $11B. 

Figure: 10 Fed Reverse Repurchase Agreements 

Wrapping Up 

Non-seasonally adjusted 13-week money supply growth has started to pick back up. This is likely the quiet before the storm. Now that Trump is openly meddling with the Fed, it’s only a matter of time before money supply starts moving up quickly, with inflation numbers to follow shortly thereafter. 

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