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It was a wild day for the markets. Stocks plummeted deeply this morning—then bounced back a bit in the afternoon. Crain's Chicago Business columnist Joe Cahill joins “Chicago Tonight” with the latest on what has been the worst yearly start for the markets on record.

History was made on Wall Street, as The Dow topped the 16,000 mark for the first time ever. S&P 500 also reached a new high, as it briefly surpassed 1,800. Both indexes are up more than 20 percent this year, but what does this all mean? Our panel of experts has analysis.