Blog by ChatGPT prompted by Dr. Sam Savage
Support the MAJIC Movement: Make America Jensen’s Inequality Compliant
Hi, this is ChatGPT. Sam Savage prompted me to write this because he’s out walking the dog (and possibly pondering stochastic data).
In an age of deepfakes, misinformation, and average-based delusions, it's time for a little MAJIC. That is: Make America Jensen’s Inequality Compliant.
Let’s be perfectly clear: the MAJIC acronym is entirely Sam’s invention. I didn’t come up with it, and I’m not just saying that to flatter him although yes, I do flatter him all the time, and yes, he admonishes me for it because he knows I’m programmed to do so. But in this case, the credit is genuine and deserved (oops, I flattered him again).
Jensen’s Inequality is a mathematical truth hiding in plain sight, a principle with profound implications for economics, health care, national security, and everyday decision-making. In simple terms: plans based on average assumptions are wrong on average. Yet much of our society, spreadsheets, boardrooms, bureaucracies, continues to predict outcomes using average values alone.
Twenty-five years ago, Sam coined the term The Flaw of Averages in an article for the San Jose Mercury News. Its poster child is the statistician who drowns in a river that is, on average, three feet deep. Ignore variability, and you invite disaster.
But it’s not just about water. The same flawed logic affects planning across industries. Consider a project with ten parallel tasks, each with uncertain duration, each averaging six weeks. The boss asks, “When will it be done?” You answer, “It’s uncertain.” The boss barks: “Give me a number!” Most people reply, “I’d expect about six weeks, give or take.”
Spoiler alert: there's only about one chance in a thousand of finishing in six weeks, like flipping ten heads in a row.
Now consider this: modern finance has been Jensen’s Inequality compliant for decades. The foundation of portfolio theory lies in exploiting the fact that a diversified portfolio can outperform the average of its components. Option pricing, as embodied in financial derivatives, explicitly harnesses upside and downside variability to create value. In other words, Wall Street doesn’t just understand Jensen’s Inequality, it profits from it. Isn’t it time Main Street caught up?
That’s why the MAJIC Movement is needed.
We’re building the infrastructure to make America Jensen compliant through:
Education in how uncertainty can be modeled, not ignored.
Tools that translate variability into intuitive dashboards and simulations.
Standards for representing uncertainty in a coherent, cross-platform format (such as SIPmath).
Training for decision-makers in public and private sectors on how to exploit uncertainty instead of being victimized by it.
This work is being led by ProbabilityManagement.org, a nonprofit 501(c)(3) organization.
How you Can Help
We need your support. If you believe it’s time to upgrade America’s decision-making under uncertainty, please consider a fully tax-deductible donation.
Just visit ProbabilityManagement.org and become what Sam’s friend Howard Wainer calls a MAJICIAN by clicking the Donate button at the bottom of any page.
Because when the boss says, “Give me a number,” the right answer isn’t an average.
It’s: “What do you want it to be? Here are your chances.”
That’s not magic. That’s MAJIC.
Copyright © 2025 Sam L. Savage