“Nowadays people know the price of everything and the value of nothing.”― Oscar Wilde
We follow the theory of Philip E. Tetlock, who has studied several related topics: forecasting future events (as detailed in a book Superforecasting (2015)), counterfactual history ("What if...?"), and some "taboo thoughts" that despite being rational, often provokes "moral outrage" (precise definition given later).
These topics are related, as we will see later. But first: What's the price of an average human life?
Answer: In America, between 1 million to 10 million.
Now, this is perfectly reasonable, as a Fermi estimate quickly shows: An average American works 50 years, with yearly salary 30000 dollars. So in full that gives 1.5 million dollars. That's a lower bound, considering that it's just cash salary and doesn't include all the other non-salary productive work, like friendship, volunteering, and writing free blog posts (like this one lol). But the order of magnitude is very much right.
Okay, if that's right, then isn't it wrong to say "A life is priceless?"
Yes. But don't say it out loud, else you get the dreaded moral outrage.