To those who believe there is a set timeframe for psychological recovery from such a tragedy.

FORBES: Save Judgment on Newtown and Those Affected By Its Tragedy

Several industries -- particularly the airline industry and the insurance industry -- have been hit hard by the aftermath of the terrorist attacks, and their progress will be watched closely as a guide to the overall U.S. economic and psychological recovery.

CNN: Recovery: More layoffs in the air

So much of this recovery, as the President has said, is psychological.

WHITEHOUSE: White House Press Briefing

The eerie resemblance in the psychological and economic backdrop of the mid-1930s and 2009--both historic junctures when recovery was thought to have begun--indicates the U.S. tiptoes on the edge of a policy mistake that could hamper the incipient recovery.

FORBES: Magazine Article