Rightmove has ‘Millions More Buyers’ than its competitors and is the undisputed best place to advertise properties, an analyst has said.

Mike DelPrete, who looks at property portals across the globe, says that the top sites benefit from network effects that give them “unprecedented market power and an impregnable moat to repel competition”.

Network effects mean that the more users a service has, the more valuable it becomes: Facebook and eBay are classic examples.

Such businesses are incredibly difficult to displace, says DelPrete, even where a challenger’s product is better.

Sellers simply want to advertise to the biggest audience possible, and buyers want the largest selection possible.

The slogan “Millions More Buyers” is used by REA Group in Australia, the world’s most profitable portal.

In the UK, says DelPrete, Rightmove’s dominance shows no sign of waning.

Of the three main portals, Rightmove had easily the most total visits in January, and the most new visits – despite both Zoopla and OnTheMarket recording larger percentage increases in their own traffic.