Shares of Alphabet, Google's parent, touched an all-time high Monday of $293.95, before giving back some of those gains, after Berkshire Hathaway disclosed it bought nearly 18 million shares valued at over $4 billion in the third quarter.The move served as an endorsement of the tech giant's artificial intelligence efforts amid heightened worries over a looming bubble. Plus, it is one of the final major investments by the conglomerate under Warren Buffett and marks a rare foray into the industry by tech-averse Berkshire.WARREN BUFFETT'S FINAL LETTER TO SHAREHOLDERSThe vote of confidence comes a...

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