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b ) On May 1 8 , 2 0 2 0 , Moderna Inc announced positive results on its vaccine against Covid 1 9 ,
b On May Moderna Inc announced positive results on its vaccine against Covid the market index S&P jumped from to in the morning, and closed at in the afternoon. Based on this information, which form of market efficiency do you think US stock market is likely to belongs to and why?
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