I ran across this notion for the first time when I started a job in finance a few years back and as an interview question they asked me about it. I hadn't heard

I ran across this notion for the first time when I started a job in finance a few years back and as an interview question they asked me about it. I hadn't heard of the notion and so afterwards tried to find some good resources online to read up about it. What I found was not great. So glad to see this idea getting a good write up.