Amazon

Amazon has an exceptionally wide and growing moat.

The company benefits from multiple durable competitive advantages: a powerful network effect in its marketplace (millions of buyers attract millions of sellers), significant customer loyalty through Prime memberships, proprietary technology, and unmatched economies of scale in both e-commerce and cloud.

Its e-commerce division leads the market with the widest product selection and fastest delivery, enabled by a superior logistics network that competitors find hard to replicate. AWS, Amazon’s cloud arm, enjoys high switching costs – once enterprises build on AWS, migrating elsewhere is costly and technically complex, which helps lock in customers.

Moreover, Amazon’s scale in cloud (around one-third of the market, making it a leader) gives it cost advantages in infrastructure and a rich ecosystem that reinforces its dominance. The breadth of these moats – spanning brand trust, Prime perks, seller infrastructure, and cloud services – make Amazon’s competitive advantage both wide and durable.

It would be extremely challenging for any new entrant or existing rival to erode Amazon’s market position in the foreseeable future.