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Welcome to Thoughts on the Market. I'm Serena Tang, Morgan Stanley's Chief cross Asset Strategist. Today, does the 6040 portfolio still make sense and what can investors expect from long term market returns? It's Monday, December 22nd at 10am in New York. Global equities have rallied by more than 35% from lows made in April and US high grade fixed income has seen last 12 months returns reach 5% above the averages over the last 10 years. This raises important questions about future returns and how investors might want to adapt their portfolios. Now work shows that long run expected returns for equities are lower than in previous decades, while fixed income think government bonds and corporate bonds still offers relatively elevated returns thanks to higher yields. Let's put some numbers to it. Over the next decade we project global equities to deliver an annualized return of nearly 7% with the S&P 500 just behind at 6.8%. European and Japanese equities stand out, potentially returning about 8%. Emerging markets however lag at just about 4%. On the bond side, we think US treasuries with a 10 year maturity will return nearly 5% per year, German bonds nearly 4 and Japanese government bonds nearly 2. They may sound low, but it's all above their long run averages. But here's where it gets interesting. The extra return you get for taking on risk, what we call the risk premium, has compressed across the board. In the US the equity risk premium is just 2% and for emerging markets it's actually negative at around minus 1%. In very plain terms, investors aren't being paid as much for taking on risk as they used to be. Now why is this the case? It's because valuations are rich, especially in the us. But we also need to put these valuations in context. We yes, The S&P 500's cyclically adjusted price to earnings ratio is near the highest level since the dot com bubble. But the quality of the S&P 500 has improved dramatically over the past few decades. Companies are more profitable and free cash flow money left after expenses is almost three times higher than it was in 2000. So while valuations are rich, there is some justification for it. The lower risk premiums for stocks and credit, regardless of whether we think they are justified or not, has very interesting read across for investors. Multi asset portfolios, the efficient frontier, meaning the best possible return for any given level of portfolio risk, has shifted. It's now flatter and lower than in previous years. So it means taking on more risk in a portfolio right now won't necessarily boost returns as much as before. Now let's turn our attention to the classic 6040 portfolio, the mix of 60% stocks and 40% bonds that's been a staple strategy for generations. After a tough 2022, the strategy has bounced back, delivering above average returns for three years in a row. Looking ahead, though, we expect only around 6% annual returns for a 6040 portfolio over the next Dec. Versus around 9% average return historically. Importantly, though, advances in AI could keep stocks and bonds moving more in sync than they used to be. If that happens, investors might benefit from increasing their equity allocation beyond the traditional 6040 split. Either way, it's important to realize that the optimal mix of stocks and bonds is not static and should be revisited as market dynamics evolve. In a world where risk assets feel expensive and the old rules don't quite fit, it's essential to understand how risk, return and correlation work together. This will help you navigate the next decade. The 6040 portfolio isn't dead and optimal multi asset allocation weights are evolving and so should you. Thanks for listening. If you enjoy the show, please leave us a review wherever you listen and and share your thoughts on the market with a friend or colleague today.
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Host: Serena Tang, Chief Cross Asset Strategist, Morgan Stanley
Date: December 22, 2025
Serena Tang analyzes whether traditional portfolio strategies, particularly the classic 60/40 split between equities and bonds, remain effective amid falling risk premiums and high market valuations. The episode provides data-driven projections on long-term returns across global asset classes, explores the implications of compressed risk premiums for investors, and discusses how optimal portfolio construction is evolving in today’s market environment.
Recent Performance:
"Global equities have rallied by more than 35% from lows made in April and US high grade fixed income has seen last 12 months returns reach 5% above the averages over the last 10 years." (A, 00:18)
Projected Long-Term Returns:
"Over the next decade we project global equities to deliver an annualized return of nearly 7%...Emerging markets however lag at just about 4%." (A, 00:45)
Compression Across Asset Classes:
"In very plain terms, investors aren't being paid as much for taking on risk as they used to be." (A, 01:36)
Valuation Context:
"While valuations are rich, there is some justification for it." (A, 02:09)
Recent Performance:
Forward-Looking Outlook:
"Looking ahead, though, we expect only around 6% annual returns for a 6040 portfolio over the next Dec. Versus around 9% average return historically." (A, 03:17)
AI and Correlations:
"If that happens, investors might benefit from increasing their equity allocation beyond the traditional 6040 split." (A, 03:40)
Key Takeaway:
"The 6040 portfolio isn't dead and optimal multi asset allocation weights are evolving and so should you." (A, 04:36)
"Investors aren't being paid as much for taking on risk as they used to be." (A, 01:36)
"S&P 500's cyclically adjusted price to earnings ratio is near the highest level since the dot com bubble. But the quality...has improved dramatically." (A, 01:51)
"The efficient frontier...is now flatter and lower than in previous years, so it means taking on more risk in a portfolio right now won't necessarily boost returns as much as before." (A, 02:30)
"It's important to realize that the optimal mix of stocks and bonds is not static and should be revisited as market dynamics evolve." (A, 03:54)
This episode emphasizes that while traditional portfolio strategies like the 60/40 mix are not obsolete, they require a thoughtful, adaptive approach as risk premiums compress and market dynamics shift. With lower forward-looking returns, diminished risk premiums, and increased correlation potential between equities and bonds (possibly fueled by AI), investors should regularly reassess their portfolio allocations rather than relying solely on past formulas. The decisive message: Evolve with the markets to optimize risk and return in the coming decade.