Revolution—Not Evolution: Better Living Through Investing

Shifting views on portfolio construction

Though deemed to be “Modern” portfolio theory (MPT), the primary framework used to construct diversified portfolios and deliver risk-adjusted investment returns is now well over 50 years old. Enhancements have helped keep MPT’s 60% equity and 40% bond allocation formula relevant for decades.

First, there were improvements around how to achieve diversification. There was a pivot from a top-down allocation targeting opportunistic equity and bond investments to a bottom-up style-box and then more broadly driven factor approach. For a period, a third “alternatives” asset class joined the mix, but in recent years strategies disaggregated alternative allocations back into equities and bonds with more allocators now defining those categories as incorporating both public and private offerings.

Along the way, variations have developed in the portfolio template. Rather than allocating percentages of the portfolio across equity and bond exposures, by the early 2000s there was an emphasis on separating liquid from illiquid strategies to capture an “illiquidity premium.” This was followed by “portable” alpha approaches that separated alpha-seeking strategies from broader market return-seeking strategies. Growth in passive funds and ETFs allowed for the emergence of today’s “core-satellite” approach that fully separates out beta and alpha.

All these changes iterated the way that the portfolio was configured, and the types of investments chosen for it, but the purpose and nature of the portfolio itself was never questioned. The investment portfolio existed to capture the benefits of diversification and compounding to produce long-term risk-adjusted returns. This singular view of the portfolio’s purpose is beginning to change.

Shifting views on portfolio purpose

By the mid-2010s, a new view of investment portfolios was emerging. Thinking evolved in line with better computing and data-processing technologies that allowed for more flexible consideration of an investor’s goals. An investment portfolio did not need to be a singular thing that solely sought long-term risk-adjusted returns. There could be many types of investment portfolios that could deliver an entire array of outcomes. Asset and wealth managers could deliver an entire suite of investment “solutions” that might expand on accumulation strategies to offer income generation, capital protection or inflation protection as other options.

This idea of making the portfolio “client-centric” as opposed to “product-centric” continued to evolve as improved technologies allowed for democratized access to separately managed accounts, which once had been the domain of only institutions and the very wealthy. These offerings are now viable at much lower dollar thresholds. Investment and wealth managers can assemble a targeted solution for an investor, choosing from an expansive set of model portfolios that deliver the “formula” for creating a portfolio—achieving its desired outcome and providing access to not just a set of funds, but the individual constituents of those funds.