Which AWS Cloud benefit enables lower costs because AWS aggregates usage across all customers?

Economies of scale are the primary benefit that allows AWS to offer lower prices. By aggregating the usage of millions of customers, AWS achieves massive purchasing power for hardware, infrastructure, and energy. This allows them to negotiate lower prices from suppliers and pass those savings on to customers in the form of lower service costs. "No need to guess capacity" is a benefit of cloud elasticity, allowing you to scale resources up or down as needed, but it doesn't directly explain lower costs due to aggregated usage. "Ability to go global in minutes" and "Increased speed and agility" are also significant AWS benefits, but they relate to deployment and operational efficiency, not the cost savings derived from the collective usage of all customers.