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No model is better than a faulty model
Trying to model something that escapes modelization is the heart of the problem. We like models because they do not require experience and can be taught by a 33-year-old assistant professor. Sometimes you need to say, “No model is better than a faulty model” - like no medicine is better than the advice of an unqualified doctor, and no drug is better than any drug.
Let me blame business schools and the financial economics establishment - they have a vested interest in promoting models and devaluing common sense.
I worked on Wall Street for close to two decades in trading and risk management of derivatives. I noticed that while portfolio models got worse and worse in tracking reality, their use kept increasing as if nothing was happening. Why? Because in the past 15 years business schools accelerated their teaching of portfolio theory as a replacement for our experiences. It looks like science, and they have been brainwashing more than 100,000 students a year. There is no way my experiences can be transmitted to the next generation because of these schools. We’ve had fiascoes in finance that they need to neglect because they contradict their models. The problem may also be the Nobel in economics that gave a stamp to these junky theories. Someone needs to make the Nobel committee account for this, for the damage to society - and I hope to do so.
