Given that this is a Y Combinator site, and frequented by startup enthusiasts, I am confused and concerned about the lack of interest in this article. This is exactly the kind of thing that young entrepreneurs need to read.
Was disappointed to find out this is about <i>economic</i> moats vs <i>physical</i> ones<p>I was looking forward to discussions of round-vs-angular, filled-with-water, containing hazards, etc around forts and castles