Investor wealth tumbled by a whopping Rs 3.36 lakh crore in two successive sessions of decline in the equity market following escalation in tensions in the Middle East. Equity markets fell for second consecutive session, with the 30-share key BSE index plummeting 787.98 points, or 1.90 per cent, to close at 40,676.63, on Monday. During the trade, it dropped 850.65 points to 40,613.96.