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Stocks and Long-Dated Treasuries Are Moving Together More Often
The pattern includes 30-year Treasury bonds and weakens the diversification benefit of holding stocks alongside long-dated debt.

Stocks and long-dated Treasury bonds have shared a direction more often than they did 10 years ago, weakening the risk-spreading benefit investors have expected from holding both asset classes.
The pattern extends to 30-year Treasury bonds. When stocks and bonds move together more frequently, holding both provides less diversification than investors have traditionally expected.