You want to dig your well where you have the best chance of finding water with the least amount of digging
Theodore LevittEvery major industry was once a growth industry. But some that are now riding a wave of growth enthusiasm are very much in the shadow of decline. Others that are thought of as seasoned growth industries have actually stopped growing. In every case, the reason growth is threatened, slowed, or stopped is not because the market is saturated. It is because there has been a failure of management.
Theodore Levitt