Actually we used to have a curious form of economy for the longest time in many parts of Europe where key infrastructure was in the hands of the state while the rest of the economy worked out in a market economy. The net result was that there was a lot more competition for the consumer market because the playing field for the competitors was a lot more level.
In this example it would mean that the cables would be owned by a state controlled monopoly while the ISPs compete on equal footing by renting cable from the state monopoly and providing the ISP service to the customers. Much lower entrance cost into the market meant that a lot of small ISPs competed, allowing the price to drop. Then in their unending wisdom our regulators decided to "liberate" the market because that bad, bad state government made everything so terribly expensive due to all the red tape and bureaucracy that state monopolies entail.
Now, about 15 years after the monopoly fell, we have two major ISPs left, zero competition between the two (who curiously seem to divine whenever the competitor raises the price and matches it immediately), prices are up at the ceiling, bandwidths have been stagnant for a few years now, cables are congested because nobody invests in new infrastructure and the whole shit is going down the drain.
Thanks, free market!