Jim Cramer says the ‘worst of 3 worlds’ helped lead stocks lower on Thursday

1. Hot economic data: Initial weekly jobless claims for the week ending Dec. 17 rose by 2,000 to 216,000, according to the Labor Department. That's less than the Dow Jones consensus estimate of 220,000.
2. Weak corporate earnings: CarMax shares fell about 3.7% after the company reported weaker-than-expected profit and revenue in its latest quarter. Micron Technology shares slipped 3.4% after the company reported a wider-than-expected quarterly loss and miss on revenue after the close on Wednesday.
3. Bearish comments about the market: David Tepper, founder of Appaloosa Management, told CNBC on Thursday that he's leaning short on equities because it's unusual for global central banks, including the Federal Reserve, the European Central Bank and Bank of England, to tighten at the same time. $SPDR S&P 500 ETF (SPY.US)$ $Invesco QQQ Trust (QQQ.US)$ $ProShares UltraPro Short QQQ ETF (SQQQ.US)$ $ProShares UltraPro QQQ ETF (TQQQ.US)$