"Disciplined Systematic Global Macro Views" focuses on current economic and finance issues, changes in market structure and the hedge fund industry as well as how to be a better decision-maker in the global macro investment space.
Monday, March 30, 2026
Debiasing decisions - Some simple rules to follow
AI - all the time for business
You have to love some of these charts that bundle ideas that seem to be unrelated. In this case, we find that the word "AI" is used more often on earnings calss than the word "earnings". We should expect that the word earnings is fairly static on earnings calls, but the explosion of the word AI suggests that this is the what management and investors have as their main focus. For management, using the the word AI convesy what they are doing new to address issues of tehcnology and effciency. Investors want to know how firms are using new technology. The question is whether AI will actually lead to the efficiency gains that many expect.
Decision focused learning and portfolio selection
One of the more interesting papers on portfolio management links prediction with optimization. Rather than a two-step process, the authors focus on how optimization should be managed alongside prediction. The paper, “Return Prediction for Mean-Variance Portfolio Selection: How Decision-Focused Learning Shapes Forecasting Models”, provides insights on how decision-focused learning (DFL) can be used to improve overall portfolio returns.
The usual process for building a portfolio is through mean-variance optimization. This process is two-staged. It is a predict-then-optimize method. In the first stage, a set of expected returns is generated, and in the second stage, the optimization selects the set of assets that maximizes return subject to a set of constraints. The problem with MVO has been studied extensively. The issue is that if the expected returns are poorly defined, the MVO will choose the “best" returns, yet the portfolio may be optimized on the forecast errors. The classic answer from Markowitz is that estimating expected returns is the investor’s job, not the optimizer’s.
The DFL framework will integrate the prediction and optimization to improve the outcomes. The issue is whether the MSE of forecasts for each asset is treated independently and equally or integrated with asset correlations. With DFL, the optimization accounts for prediction errors when finding the weights via a loss or regret function.
It is found that DFL identifies fewer assets than a standard MVO and exhibits a bias toward positively returning assets, given the optimization for a long-only portfolio. Still, it offers a better way to optimize a portfolio.
Saturday, March 28, 2026
Pric e action by Rhetoric: Trump and Oil
The FT chart provides an interesting insight into the drivers of the current oil market. Of course, oil is driven by the events of the Iran War, yet the impact on oil prices is more subtle. There seems to be a direct connection between President Trump's comments and the surge or decline in oil prices. When Trump makes comments that escalate tensions, usually before or on a weekend, there is a surge in prices, followed by comments that de-escalate tensions. The uncertainty in prices is associated with rhetoric rather than specific action surrounding Iran. The sample is small yet there may be a link between comments and oil price action.
Thursday, March 26, 2026
Dual role of prices - endogenous and exogenous events
...dual role of prices. By “dual role”, we mean that prices not only reflect the underlying economic fundamentals, they are also an imperative to action. That is, prices induce actions on the part of the economic agents. If some actions are the consequence of binding constraints and exert harmful spillover effects on others, then price changes can bring about amplifying spillover effects that disrupt the smooth working of the market, and sometimes shut down the market completely.
Endogenous Extreme Events and the Dual Role of Prices
It is important to appreciate the dual role of prices, although this is a subtle concept. Prices first reflect exogenous events as markets reflect new information that impacts expectations. If inflation increases, for example, there will be a reaction in prices as investors adjust their expectations. However, investor will not just react to new information and adjust their portfolios. They will also adjust or take action when they see prices change.
The reaction to price movements may be independent of the change in exogenous information. The reaction could be due to uncertainty about what information is being displayed in the price. A reaction to price behavior independent of exogenous information is an endogenous reaction. Investors react to prices rather than to any other information. This can lead to extremes and explain most of the price movement during the day. One of the most important tasks for an investor is understanding the difference between these price moves and appreciating the action that stems from the distinction between exogenous and endogenous moves.
Tuesday, March 17, 2026
Neoliberals and the fight between dominium and imperium
What I found most interesting was the focus on differences between dominium and imperium capitalism. Dominium refers to the rights of owners to control their property, which is a key feature of capitalist private property. The imperium or public power refers to the sovereign power of the state to rule, tax, and regulate. The intersection between these two forms of capitalism is the crux of how neoliberalism bears on the issue.
For Slobodian, neopliberalism is not a simple version of laissez-faire capitalism, but a project to, as he terms it, “encase” the market within legal and institutional frameworks to ensure that dominium is protected over imperium. Global capital is protected from democratic pressures, nationalism, and social redistribution that seek to take property away from owners. Thus, dominium is given a higher priority over imperium, and the right to rule by nations is constrained by international institutions. Capitalism is not left to self-regulate but needs oversight and active management to protect the dominium. Neoliberals believe there is a need to constrain democracy in a pure form that will subvert property rights in an effort to redistribute wealth. Neoliberals want an active legal framework to protect property rights and allow the freedom of capital to move and be controlled by owners.
Sorkin's 1929 - A tale of personality
I finally got around to reading Andrew Ross Sorkin’s 1929: Inside the Greatest Crash in Wall Street History - and How it Shattered a Nation. His narrative style is compelling for those who do not want to read dry financial history. The characters come alive with his writing, but I did not come away with any new insights into the stock market crash. There were signs before the October crash, so it was not a total surprise. Excess leverage, margins that were too low, excess greed, and herd mentality, but we already knew that. While I liked reading about the characters, I kept asking why we didn’t hear more about the central bankers. What about some of the surviving brokers? How about some of the businessmen outside of Wall Street?
Do I better understand the psychology of bubbles and the 1929 crash? I don't think so. Perhaps I am jaded by all my reading on the topic, but did I learn anything new beyond the fact that the same tropes of greed and leverage are always with us?
What does 1929 tell us about markets today? Not much. There is significant leverage, crowd behavior, misinformation on policy choices, and fear of taking action. Perhaps that is the message. Things don't change.
Saturday, March 14, 2026
Words have uncertainty - The enemy of precision for investors
With the evolution of LLM and natural language processing, there is a closer connection between the discretionary and quantitative world, yet the two are not perfectly linked. There is uncertainty in both worlds. For the quant, there is model and parameter uncertainty. For the discretionary trader or non-quant, the problem is the precision in words. What you say may not be precise by you as the sender and by the receiver.
We have discussed this issue of precision in language in the past, yet most investors still seem to be at risk from word uncertainty. Just think of all the Twitter words and Substack posts driven by language. Are these words given any quality control? If you look at the research, the answer is no. If you look at the range of meaning for these words of estimative probability, you will have to agree that there is ambiguity concerning the words often used by any decision-maker. Ask for specifics. Ask for the actual probabilities. Close the range of uncertainty.
Risk management is in the preparation
Facts, information, and knowledge - Not all the same
There are no facts, only interpretations - Friedrich Nietzsche.
What is a fact? A snippet of information. Something you did not know. A fact is unprocessed information. It does not have any context. Information is processed facts. There is some meaning or context given to the fact. Knowledge will be the applied understanding of that information or fact. Anyone can spout facts with no meaning but facts are usually used in an argument. Facts are used to persuade. Facts, when used as a tool of persuasion, need to be turned into information through knowledge.
Are facts reality? Yes. Facts do not have feelings. Yet knowing facts is not useful without processing and some knowledge; that is where most get into trouble. The disagreement is not with the facts but with the interpretation.
Friday, March 13, 2026
More on the Sharpe ratio - Look for its stability
A recent paper introduces a new concept to help investors assess managers and trading strategies: the Sharpe Stability Ratio (SSR). See “The Sharpe Stability Ratio:Temporal Consistency of Risk-Adjusted Performance”. This performance metric accounts for the temporal consistency of risk-adjusted returns. An investor, if given two Sharpe ratios with the same value, should choose the one that has more stable characteristics. You should like the persistent Sharpe ratio. This paper treats the Sharpe ratio as a rolling performance measure. It defines stability as the ratio of the mean rolling performance to the heteroskedasticity- and autocorrelation-consistent (HAC) standard deviation.
Using the time-series approach can help analyze point-in-time SR or the probabilistic Sharpe ratio (PSR). Given strong serial correlation in the Sharpe ratio, arising from the rolling average and return consistency, the HAC correction provides a better measure than simply scaling by the standard deviation.
The important issue for investors is to look at persistence and consistency with strategies. This may be the true hallmark of skill.
Monday, March 9, 2026
Uncertainty about signals and price impact
Every model will have signal noise or uncertainty, and every model will have imprecise impact uncertainty from trading. This is a certainty because any training set will have to be imperfect. Hence, we should expect performance problems due to parameter uncertainty. Modelers should take this into account in their work.
First, the model’s Sharpe ratio will be lower than expected from what is generated from the training set. There will be estimation error and model misspecification. Second, the model will affect transaction costs, with the impact being greater for smaller and less liquid stocks. Notably, weak signals will have less impact on trading costs, while strong signals will have a greater impact on trading costs. See “Trading with Uncertainty about signals and price impact”.
How do you solve these problems? One way to solve the problem is to define a reference model and then assess the costs associated with variations from it. The uncertainty can be managed to lock in a reasonable Sharpe around the reference level. The math in this paper is not easy, but the key is to be aware of the problem and to place bounds on what is possible.
Sunday, March 8, 2026
Beta is sensitive to the level of risk aversion
We have just written about the impact of changing beta. See There is no one beta - It changes across regimes. This is not new information, but researchers have taken a deeper look at the issue and have found some interesting relationships. Another paper that has found an interesting beta relationship is “Risk Appetite and (Mis)Pricing”. It has examined some beta portfolios conditional on high and low risk aversion. The risk aversion index was developed in prior research and is not new, but it has not been used in this type of study.
The results are strong and very thought-provoking. In a high-risk aversion environment, the researchers find a positive relationship between beta and returns. In contrast, in a low-risk aversion environment, there is a slight negative relationship between beta and returns. This can help explain why we do not find the usual CAPM relationship in the data. When risk aversion is high, the market risk premium idominatesother factors that may create distortions, such as sentiment. When risk aversion is low, mispricing becomes more important, and there is a positive relationship with a positive intercept. The study carefully examines the evidence and finds that risk aversion plays a key role in determining whether the CAPM holds or fails. When aversion to risk is low, sentiment-driven mispricing will be the key driver of returns and will offset the market risk premium effect.
Saturday, March 7, 2026
"Look at your fish" - same with market prices
There is importance in looking closely at the things we study. There is an old parable from Samuel Scudder called "Look at your fish". The story can best be described in "The Student, the Fish, and Agassiz," a 19th-century educational parable in which Harvard professor Louis Agassiz forces a student to study a dead fish for days, using only observation and sketching, to teach that true knowledge comes from intense, firsthand examination. It emphasizes finding "general laws" through detail.
The same process can be applied to markets. We can start with price charts. Look at your charts. Look at the prices, but just don't look once; look deeply into what the markets may be saying. Then, after looking at the prices, look at the news surrounding the prices. This does not mean that everything has to have a pattern, but for any analysis, the first order of business is looking at the data.
See before starting to analyze.
There is no one beta - It changes across regimes
An interesting but simple paper, “Your Beta Is Wrong Regime-Dependent Alpha & Beta for Major Asset Classes”, explores the issue of regime-dependent beta. Your beta is not stationary, so alpha will not be stable but will move with the regime. This does not mean that you should calculate beta on a rolling basis; assume that beta is regime-dependent, and when the regime changes, so does the beta. Below are two examples of significant changes in beta. One shows silver, and the other is for Alphabet, one of the classic Mag 7 stocks.
Do not assume there is one beta for any asset. This may seem obvious, but when seen in a distribution, the numbers are stark.
Wednesday, March 4, 2026
Think of global equity markets as a network
Good News - Bad News - overreaction to the bad news
Monday, March 2, 2026
Oil shocks and war - This could be different
Monday, February 23, 2026
Retail investors love hard to value stiocks
Asset allocation is always about the stock-bond correlation
Monday, February 16, 2026
Meaaurement uncertainty is real
Innovation, industrial policy and controlling the fate of nations
Sunday, February 15, 2026
The complexity of trade - not always simple
The relative US - EM inflation story
Saturday, February 14, 2026
What drives performance of machine learning
Risk appetite is always worth following - Currently, normal
China growth coming in lower
Asset allocation of university endowments
King dollar - can it be toppled
Friday, February 13, 2026
Buffered ETF - the product of 2026?
For better or worse, the top ETF product for 2026 may be the buffered ETF. At a very general level, a buffered ETF, is one that provides downside protection versus some referenced index. That is, there is a buffer on the losses associated with the ETF. However, in exchange for this protection, the investor wil give-up some of the upside. The market has grown from approximately $5 billion in 2020 to a $90 billion AUM as of the end of 2025.
This type of protection can be achieved by managing the portfolio. There is a cost with having the ETF provide you protection, yet there always seems to be a need for these products. First, the mechanism for offering this protection is systematic and removes emotion from any allocation decision. Second, the timing of the protection is well-defined. Yet the payoff structure is complex and comprises multiple option positions. There are parts of the distribution that are protected or buffered, parts that are exposed to risk, and an upside portion that is capped. The folks at Alpha Architect provide a good overview of the problem.
Realize that if you want protection from downside risk, there is no free lunch. If you move to cash, you lose the upside. If you buy derivatives, there is a cost. If you allocate to alternatives, you are at the mercy of their return profile. Choose your protection wisely.


















































