There are 3 types of businesses based on moats – great, good, gruesome. Companies which earn 40% RoE, those are great businesses because the moat keeps becoming bigger. In good businesses you start with 20% and it remains 20%. So every time you want to grow the business you have to put in more capital. The real difficult part and this is 95% of the market is gruesome. These are companies with negative moats. The problem is not with the business but the manager trying to grow a bad business. Then it becomes a bottomless pit into which you throw capital. Loss making PSU companies are a prime example, just think of how much money the government has to pump in.