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Investors became richer Rs 2.20 lakh crore on Monday and the market capitalisation of BSE-listed firms reached an all-time high of Rs 3.91 lakh crore as buoyant sentiment sustained the stock market rally for the fifth straight session. The 30-share BSE Sensex benchmark climbed 281.52 points or 0.39 per cent to close at 72,708.16, while NSE Nifty ended at its all-time high of 22,122.25 points, up 81.55 points or 0.37 per cent from the previous close.