From This Collection
If one quarter differs significantly from another, it's hard to paint a picture of the entire year.
They can indicate where the market is going to open, but they're not a crystal ball.
Was it a predictable event? Then Wall Street's reaction might already be "priced in."
"It's really a measure, I think, of worker confidence in the economy," said Tara Sinclair of George Washington University.
"It's not as simple as it might seem," said Andrea Eisfeldt of UCLA.