Kazuhiro Nogi | AFP | Getty Images
Over the long term, a strong dollar is not bad for the stock market. In fact, studies show it's generally a positive trend over many years. But in the short term, moves higher in the greenback can be jarring as traders focus on the immediate impact to multinationals' exports and other negative effects.
The euro-USD fell to $1.04 on Thursday, 4 cents shy of parity. If it falls to parity before the end of 2016, it could spell trouble for investors hoping for a Santa Claus rally that takes the Dow Jones industrial average above 20,000, history shows.
Using Kensho, we looked at what happened to the Dow whenever the euro fell 4 cents in two weeks vs. the U.S. dollar. This occurred 42 times in the last decade:
