If you're going to compare ISPs and grocery stores, you might want to include turnover in your model. (the person who invests in groceries, and turns over thei

If you're going to compare ISPs and grocery stores, you might want to include turnover in your model. (the person who invests in groceries, and turns over their inventory 15 times per year, faces a very different business from the person who invests in speculative software, and sees a handful of exits per career; the person running an ISP is likely somewhere in between those extremes)