A key advantage of TPA over a Strategic Asset Allocation (SAA) model is its ability to evaluate hybrid or novel investments that don't fit into predefined buckets. By focusing on an investment's contribution to total portfolio risk and return, TPA can approve valuable opportunities that would otherwise be rejected for not fitting a silo.

In a TPA model, diversification is a total-portfolio responsibility. This frees individual teams from needing to diversify within their silo. They can build more concentrated, high-conviction portfolios, as their contribution is assessed at the whole-fund level, where diversification is achieved across different strategies.

Unlike traditional asset allocation where portfolio decisions are jointly owned, TPA clarifies governance. The board sets a risk appetite via a reference portfolio, but management is solely accountable for constructing and managing the actual investment portfolio, making their performance directly and transparently measurable.

Despite recognizing the S&P 500 is now a concentrated bet, governance boards are reluctant to change it as their primary benchmark. Deviating from the industry standard introduces significant career risk, as it can be perceived as an attempt to retroactively justify underperformance, creating institutional inertia.

Stephen Gilmore's first step in moving CalPERS to TPA was demonstrating to the board that a simple stock/bond portfolio closely tracked the fund's actual performance. This revealed the fund's primary risk drivers were simple betas, making the case for a reference portfolio and a more holistic management approach more intuitive.

Moving from Strategic Asset Allocation (SAA) isn't about taking on more risk. CalPERS calculated that their existing SAA policy ranges already allowed for a ~450bps active risk budget. TPA maintained this budget but granted flexibility to deploy it across the entire portfolio, unconstrained by rigid asset class silos.

A truly diversified institutional portfolio is guaranteed to generate dissatisfaction at any given investment committee meeting. Committee members naturally praise outperforming line items above the benchmark line while questioning why the underperforming items below the line are held at all. Allocators must consistently anchor the committee in expected contributions across varying macro environments, recognizing that line-item friction is the explicit cost of multi-regime portfolio resilience.

Instead of fixed allocations to asset classes like "private equity," CPP Investments uses a "total portfolio approach." They analyze investments based on underlying economic exposures (factors) like duration or inflation sensitivity. This prevents misleading labels and forced rebalancing, creating a more resilient portfolio.

Advisors who recommend fixed allocations like 60/40 without considering current expected returns and risk are committing a form of 'malpractice.' Investment decisions must be dynamic, as the relationship between risk and return is not constant over time.