ANGELA WEISS / AFP via Getty Images GMO's Ben Inker predicts weak S&P 500 returns due to high AI stock concentration. Inker expects a market rotation from expensive AI stocks to cheaper sectors in 2026. He favors Japanese small-cap stocks and European value stocks over US growth stocks. If you're familiar with GMO, the asset management house cofounded by value investing legend Jeremy Grantham, you know the firm tends to issue bearish forecasts for the broader market. So you may not be surprised t ...