Computing On Demand
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Amazon EC2 reduces the time required to obtain and boot new server instances to minutes, allowing you to quickly scale capacity, both up and down, as your computing requirements change. Amazon EC2 changes the economics of computing by allowing you to pay only for capacity that you actually use.
Amazon , EC2 Sales Pitch 2009
This is how utility computing changes the game. This is the technical challenge posed by Cloud Computing.
The Plastic Limit
At the end of the month, your credit card will automatically be charged for that month's usage.
Amazon , S3 Billing FAQ 2009
Data center capacity is limited by those servers present
Cloud capacity is limited by access to credit