The Return of Tariff Man

Preface: Explaining our market timing models 

We maintain several market timing models, each with differing time horizons. The "Ultimate Market Timing Model" is a long-term market timing model based on the research outlined in our post, Building the ultimate market timing model. This model tends to generate only a handful of signals each decade.

The Trend Asset Allocation Model is an asset allocation model that applies trend-following principles based on the inputs of global stock and commodity prices. This model has a shorter time horizon and tends to turn over about 4-6 times a year. The performance and full details of a model portfolio based on the out-of-sample signals of the Trend Model can be found here.

 

My inner trader uses a trading model, which is a blend of price momentum (is the Trend Model becoming more bullish, or bearish?) and overbought/oversold extremes (don't buy if the trend is overbought, and vice versa). Subscribers receive real-time alerts of model changes, and a hypothetical trading record of the email alerts is updated weekly here. The hypothetical trading record of the trading model of the real-time alerts that began in March 2016 is shown below. 

  

The latest signals of each model are as follows:

• Ultimate market timing model: Buy equities (Last changed from “sell” on 28-Jul-2023)*
• Trend Model signal: Bullish (Last changed from “bearish” on 27-Jun-2025)*
• Trading model: Neutral (Last changed from “bullish” on 31-Jul-2025)*

* The performance chart and model readings have been delayed by a week out of respect to our paying subscribers.

Update schedule: I generally update model readings on my site on weekends. I am also on X/Twitter at @humblestudent and on BlueSky at @humblestudent.bsky.social. Subscribers receive real-time alerts of trading model changes, and a hypothetical trading record of those email alerts is shown here.

Subscribers can access the latest signal in real time here.

 

The Bearish Trigger?

The trade truce was too good to be true. That all changed last Friday when President Trump upended the trade truce in response to heightened Chinese control on exports with rare earth elements. Trump threatened higher tariffs on China in a Truth Social post. He added, “I was to meet President Xi in two weeks, at APEC, in South Korea, but now there seems to be no reason to do so.” Later in the day, he announced an additional 100% tariff on Chinese exports on top of the current 30% duty and added export controls on critical software. 

Even though my trade war factor had been signaling rising anxiety since early August as U.S. companies with domestic revenues were leading the equal-weighted S&P 500, implied stock and bond volatility (bottom panel) had been tame for months. To be sure, tariffs were starting to bite, but most trade partners declined to retaliate. Implied volatility readings were in the “Assertive Trump” zone. It was only a matter of time before Trump spent some of the built up political capital to assertive his authority.

Stock prices were rattled by the news. I had been warning for weeks that the market is extended and could pull back at any time. Is this the bearish trigger?

 

 The full post can be found here.