>Because as soon as the competition would start digging the incumbent simply lowers prices. So the monopoly would have to keep the prices low all the time, sin

>Because as soon as the competition would start digging the incumbent simply lowers prices. So the monopoly would have to keep the prices low all the time, since the competitors would appear all the time is the demand exist. It's not what monopolies do. Did Walmart lower the prices when Amazon appeared? Why to be a monopoly and not use this state of affairs to squeeze the profits?