Expand this to include a more substantial audience of, say, 5m viewers requesting multiple movies, and suddenly the cost to the content provider becomes prohibitive.

ECONOMIST: MONITOR

Critics argue that there is nothing to stop firms from trading electronically at the moment, or from requesting quotes from multiple dealers.

ECONOMIST: Derivatives exchanges

The requesting Inspectors General are tasked with overseeing investigations that can take multiple years to complete, and the oversight work often begins in earnest during the final phases of a project.

WHITEHOUSE: The White House