For decades, the 60/40 portfolio has been one of investing’s most reliable rules of thumb: Put 60% of your money in stocks for growth, 40% in bonds for stability, rebalance occasionally and let time do the rest. But one of the world’s largest investment firms is suggesting it may be time to flip that script. Recent statements from Vanguard, amid widespread worries about a stock-market bubble thanks to the frothy AI industry, suggest that a 40/60 portfolio – more bonds, fewer stocks – could deliver similar ...