Which benefit of the AWS Cloud helps companies achieve lower usage costs because of the aggregate usage of all AWS users?

"No need to guess capacity" refers to the elasticity and scalability of the cloud, allowing resources to be scaled up or down as needed, which contributes to cost optimization but is not the direct cause of lower usage costs due to aggregate usage.

"Ability to go global in minutes" refers to the global infrastructure of AWS and the ease of deploying resources in multiple regions, a benefit for reach and latency, not directly for lower usage costs from aggregate usage.

Economies of scale is a fundamental benefit of cloud computing where providers like AWS achieve lower per-unit costs by operating at a massive scale and serving thousands of customers. These cost efficiencies from aggregate usage are then passed on to customers through lower prices, making cloud usage more cost-effective.

"Increased speed and agility" refers to the ability to rapidly provision and de-provision resources, innovate quickly, and respond to market changes, which is an operational benefit, not the direct cause of lower usage costs from aggregate usage.