Core Insights - U.S. stocks have rallied over 16% this year, but they are underperforming compared to global markets, with the MSCI global index up more than 19% and other indices like London's FTSE 100 returning 21% and BlackRock's iShares MSCI Emerging Markets ETF gaining over 32% [1][2] Group 1 - Goldman Sachs predicts that U.S. stocks will continue to underperform relative to other global markets over the next decade due to high valuations in the U.S. and stronger expected growth in other countries [2]