That's a coincidence... When thinking about this before, I settled on the term "luck surface area" as well. My version had one axis for "things you can do", an

That's a coincidence... When thinking about this before, I settled on the term "luck surface area" as well. My version had one axis for "things you can do", and another axis for "number of people who know about the things you can do". The theory being - the larger the area, the luckier you'll be. It came out of recollections about people I've met. One or two working on amazing projects at home and telling almost no-one, and others networking like crazy but with little substance behind it (as far as I could tell anyway) - both seemed like thin surface areas.