The impact of quantitative monetary policies is hard to understand, for investors and academics alike, but why are these impacts so complex and how might investors better understand the market implications?

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Welcome to Thoughts on the Market. I'm Matthew Hornbach, Global Head of Macro Strategy for Morgan Stanley. Along with my colleagues, bringing you a variety of perspectives, I'll be talking about global macro trends and how investors can interpret these trends for rates and currency markets. It's Thursday, September 8th, at 10 a.m. in New York. 

QT is the talk of the town. QT stands for quantitative tightening, which is meant to contrast it with QE, or quantitative easing. QT sounds intimidating, especially when respected investors mention the term and, at the same time, ring the fire alarm on financial news networks. 

Unfortunately, the exact workings of QT and QE and their ultimate impact on markets aren't well understood. And that's not just a comment about the general public's understanding. It even applies to investors who have long dealt with quantitative policies and for academics who have long studied them. 

There are four reasons why the impact of quantitative monetary policies, as the Fed has implemented them, is hard to understand. First, different institutions take the lead in determining the impact of QE versus QT. The Fed determines the first round impact of quantitative easing, while the U.S. Treasury and mortgage originators determine the first round impact of quantitative tightening. 

Second, as the phrase "first round impact" implies, there are second round impacts as well. In the case of quantitative easing, the first round occurs when the Fed buys a U.S. Treasury or Agency mortgage backed security, also known as an agency MBS, from an investor. The second round occurs when that investor uses the cash from the Fed to buy something else. 

In the case of quantitative tightening, the first round occurs when an investor sells something in order to raise the cash that it needs. What does it need the cash for? Well, to buy a forthcoming Treasury Security or agency MBS. The second round occurs when the U.S. Treasury auctions that security or when a mortgage originator issues an agency MBS in order to raise the cash that the Fed is no longer providing. 

Third, QE and QT affect different markets in different ways. QE affects the Treasury and agency MBS markets directly in the first round. But in the second round, investor decisions about how to invest that cash could affect a wide variety of markets from esoteric loan products to blue chip equities. 

In that sense, some of the impact of QE is indirect and could affect some markets more than others. Similarly with QT, investor decisions about what to sell could affect a large number of markets, again some more than others. In addition, what the U.S. Treasury issues and what mortgage originators sell can change over time with financing needs and different market environments. 

Finally, markets price these different effects with different probabilities and at different times. For example, when the Fed announces a QE program, we know with near certainty that the Fed will buy Treasuries and agency MBS and generally know how much of each the Fed will buy. So investors can price in those effects relatively soon after the announcement. 

But we don't know, with nearly the same probability, what the sellers of those treasuries and agency MBS will do with the cash until they actually get the cash from the Fed. And that could be months after the announcement when the Fed actually buys the securities. 

Figuring out the effect on markets from QT is even more complicated because even though we know what the Fed will no longer buy, we don't know exactly what or how much the U.S. Treasury or mortgage originators will sell. 

If all of this sounds complex, believe me it is. There are no easy conclusions to draw for your investment strategies when it comes to QT. So the next time someone rings the fire alarm and yells QT, first look for where there might be smoke before running out of the building or selling all of your risky assets. 

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