The Globe and Mail reports in its Monday edition that an emerging question in long-term investing is, How much of a portfolio should go into U.S. stocks? The Globe's Rob Carrick writes that after a surge of almost 30 per cent for the S&P 500 Index over the past 12 months, many diversified portfolios will almost certainly be overweighted in the U.S. market. If you own U.S. stocks or equity funds, some portfolio rebalancing is probably in order. If you have little or no U.S. exposure, get it. Asset allocation ETFs with a balanced 60:40 mix of stocks and bonds typically have about 27 per cent of their total assets in U.S. stocks. The rest of the portfolio goes something like this: 15 to 18 per cent Canadian stocks, 12 per cent international stocks and 3 to 4 per cent emerging markets. The case for investing in the U.S. market is that it is much better diversified than the Canadian market, particularly in technology. The tech stocks known as the Magnificent Seven -- Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia and Tesla, largely drove the S&P 500 gains of the past year. The Canadian market has nothing like these companies. Avoid Nasdaq funds because they are even more tech-focused than the S&P 500.