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Applying the differential diagnosis method to investing

Amarish Dave, DO
Finance
September 20, 2023
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For those of us in the field of medicine, the differential diagnosis method is second nature. It involves considering a list of potential causes (differential diagnoses) for a patient’s symptoms and systematically narrowing down the possibilities through evaluation, testing, and clinical judgment. This method helps us arrive at the most likely diagnosis and, subsequently, the most appropriate treatment plan.

Now, let’s apply this concept to investing.

Symptom recognition in investing

In medicine, patients present with symptoms, and our first task is to recognize those symptoms accurately. Similarly, in investing, “symptoms” often manifest as changes in the financial markets or economic indicators. For example, a sudden drop in stock prices, a surge in interest rates, or a change in consumer spending habits can all be considered “symptoms” in the financial world.

Generating a list of potential causes (investment opportunities)

Just as we create a list of potential diagnoses in medicine, in investing, we generate a list of potential investment opportunities. These could range from stocks and bonds to real estate, commodities, or even starting a new business venture. The goal is to have a broad spectrum of options to consider.

Systematic evaluation and testing

In medicine, we use various tests, lab results, and clinical assessments to rule out certain diagnoses and focus on the most likely one. In investing, we can apply a similar systematic approach to evaluate and test potential investments. For instance:

Fundamental analysis. Examine the financial health, growth prospects, and competitive position of a company when considering investing in its stock.

Technical analysis. Analyze historical price charts, patterns, and trading volumes to identify trends or reversals in market sentiment.

Risk assessment. Evaluate the potential risks associated with each investment opportunity, including market risk, credit risk, and liquidity risk.

Narrowing down the possibilities

As we eliminate potential diagnoses in medicine, we progressively narrow down our focus to arrive at the most accurate diagnosis. Similarly, in investing, we eliminate investment opportunities that don’t align with our risk tolerance, financial goals, or overall investment strategy. This step involves a careful and objective evaluation of each option.

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Arriving at the most likely investment decision

In medicine, the final diagnosis is often the one that best fits the clinical picture and available evidence. In investing, the most likely investment decision should align with your financial objectives, time horizon, and risk tolerance. This is the point where you’ve evaluated all options and determined the one that makes the most sense for your unique circumstances.

Continuous monitoring and reevaluation

In both medicine and investing, the work doesn’t end with the diagnosis or investment decision. Continuous monitoring is crucial. In medicine, we follow up with patients to track their progress. In investing, it’s essential to regularly review your portfolio, assess the performance of your investments, and adjust your strategy as needed.

Benefits of applying the differential diagnosis method to investing

Systematic decision-making. Just as in medicine, applying a systematic method to investment decisions helps reduce impulsive choices driven by emotions like fear or greed.

Risk mitigation. By evaluating investment opportunities objectively, you can identify potential risks and take steps to mitigate them, similar to how we manage patient risks in health care.

Alignment with goals. This method ensures that your investment choices align with your financial goals and risk tolerance, reducing the likelihood of regrettable decisions.

Adaptability. As the financial landscape changes, you can use this method to adapt your investment strategy, just as we adjust treatment plans based on a patient’s evolving condition.

The key to successful investing is creating structure out of chaos. One way to do that is using a method like one that we are all familiar with.

Amarish Dave is a board-certified neurologist with over 20 years of experience in both neurology and active stock investing. In addition to his medical career, he holds a background in business from the University of Michigan and has successfully passed the SIE exam administered by FINRA. Dr. Dave is founder, FiscalhealthMD.com, a website dedicated to educating doctors at all stages of their careers, ranging from residents to retirement, about financial planning.

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