For the most part, (NASDAQ: MSFT) and Alphabet (NASDAQ: GOOG)(NASDAQ: GOOGL) have been outperformers on the stock exchange this year. On Monday, however, investors bucked that trend. They sent the former company's share price down by nearly 2% and the latter's two stock classes groundward by almost 3%. Both were far steeper falls than the 0.2% slip experienced by the S 500 index on the day. 

Several factors were at play here. An article in The Wall Street Journal sounded a warning signal about artificial intelligence (AI), while a major stock index that Microsoft and Alphabet both belong to is going to be rebalanced.

The AI article was published Monday morning in The Journal. Citing several cloud computing experts, the newspaper said that cloud infrastructure might not be sufficient to handle the rapid rise of AI functionalities.

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Source Fool.com