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Risk matrix

As explained in Investing for Programmers

A risk matrix is an assessment framework that classifies risks by dimensions such as likelihood and potential impact.

A risk matrix classifies threats by likelihood and potential severity, helping investors identify which scenarios deserve attention first. It turns uncertain events into explicit portfolio questions and possible actions. section 7.1.3 section 7.7

Use a matrix as a practical review workflow:

  • List plausible scenarios, such as another pandemic, new trade wars, an anti-AI movement, or rising energy prices. section 7.1.3
  • Estimate each scenario’s likelihood and potential harm, recognizing that personal assessments introduce uncertainty. section 7.1.3
  • Review every position, assign risk ratings, and define what to do if the rating reaches a chosen threshold. section 7.1.3
  • Prioritize high-severity risks and prepare for worst-case outcomes, while accepting that a matrix cannot identify every nonfinancial risk. section 7.1.3 section 7.7

Trade-war scenario

For a portfolio holding Coca-Cola, Apple, and Pfizer, assess an escalation of a United States–China trade war as possible. If research suggests marginal harm to Coca-Cola and Pfizer but critical harm to Apple, the matrix assigns Apple a high-risk rating and supports a predefined response. section 7.1.3

Figure 7.3 How to map risk in a matrix based on severity and likelihood. We commonly create strategies to meet risks with higher harm severity first to mitigate the effect once the consequences become unavoidable.
figure

Inspect the severity-by-likelihood layout used to prioritize risks and mitigation strategies. section 7.1.3

How Investing for Programmers covers it

How deep it goes
Explains severity-likelihood mapping and action thresholds, but stops short of formal probability models or automated scoring.
Examples
Uses anti-AI movements, energy prices, pandemics, and United States–China trade wars across a three-stock portfolio.
What it assumes
Assumes willingness to research businesses and make personal judgments about political and market scenarios.
What you can do after
Apply it via scenario reviews to rank threats, identify exposed holdings, and define actions before consequences occur.
How it connects
Connects risk management with nonfinancial risk, portfolio diversification, margin of safety, and worst-case planning.

Related concepts

This explainer was generated by Manning's knowledge graph from the text of Investing for Programmers. The section links point to the parts of the book it draws on.