How can even a large share (70% are mentioned in the article) of landlords have full control over supply? This is different from the railroad or telco cartels o

How can even a large share (70% are mentioned in the article) of landlords have full control over supply? This is different from the railroad or telco cartels of the past where it is really hard for new players to get into the market. Getting into Atlanta's housing market is as easy as buying some land and building some apartments on it, buying up and renting out single family homes, etc. The barrier to entry is really low.