In our prior blog, we revisited the original case for the WisdomTree US Efficient Core Fund (NTSX) in the context of today’s evolving interest rate environment. After a period when stocks and bonds struggled together, the setup for bonds appears more constructive: yields are higher, real yields are positive, and duration may again have a better chance of serving as a hedge if the dominant macro risk shifts from inflation surprise to growth disappointment.

That matters because NTSX was built on the simple but powerful idea that a diversified portfolio can provide a stronger foundation than a 100% equity allocation.

But that is only the first chapter.

For advisors and allocators, the practical evolution is how NTSX and other capital-efficient ETFs can serve as total portfolio tools that deliver target core exposures with smaller capital allocations.

This can create room for other differentiated, complementary investment strategies such as commodities, managed futures, long/short equity or alternative income. Importantly, these new return streams can be added without forcing investors to make the usual trade-off of selling stocks or bonds to fund them.

The Funding Problem

Most investors understand the appeal of diversification.

They want more than one way to make money. They want parts of the portfolio that can respond differently to macro forces such as economic growth, inflation, currency movements, or commodity shocks.

But diversification has a funding problem.

In a traditional portfolio, every dollar allocated to a diversifying strategy has to come from somewhere else.

In the example below, a 60/40 portfolio that adds a 20% diversifying sleeve might become a 50/30/20 portfolio.

Figure 1: Portfolio Paradox: Incorporating Alternatives Has Historically Required Reducing Core Equity and/or Bond Exposures

As a result, the diversifying sleeve is often forced to compete psychologically with the S&P 500 during strong equity markets. And if the funding comes from fixed income, investors may also be giving up income, liquidity and the potential recession sensitivity that bonds can provide.

That combination can make even a well-designed, more efficient portfolio look worse than a traditional allocation during periods when stocks and bonds are both performing well.

It is one of the reasons diversifying strategies are often difficult for allocators and individual investors to stick with for long periods of time, and why they are so often sold right before they are needed most.

Compress the Core, Then Build Around It

The capital-efficient framework starts with a simple observation: the capital allocation and the economic exposure of a portfolio are not always the same thing.

A traditional 60/40 portfolio uses 100% of the capital to get 60% equity exposure and 40% bond exposure.

A capital-efficient ETF can seek to deliver a similar stock/bond exposure profile using less than 100% of the portfolio’s capital. The remaining capital can then be used for other strategies.

Consider the same example above. Instead of funding a 20% alternatives allocation by reducing core stock and bond holdings, investors can use capital-efficient ETFs to maintain their desired 60/40 exposure with less invested capital. The capital that is freed up can then be allocated to alternative investments and diversifying strategies. As a result, the portfolio can retain its full 60/40 core exposure while also adding a 20% allocation to alternatives—in effect achieving a 60/40/20 portfolio rather than diluting the core into a 50/30/20 allocation.

Figure 2: Efficient Core Strategies Allow Investors to Incorporate Alternatives Without Reducing Their Existing Stock and Bond Allocations

This is where the use case becomes especially important for model portfolios.

If the portfolio can maintain its intended 60/40 exposure while also creating room for alternatives, the diversifying sleeve does not need to beat equities in a bull market to be valuable. It needs to earn a return above cash (effectively the funding cost of the capital efficiency), behave differently from stocks and bonds, and provide a return stream that can help in environments where the traditional portfolio is more challenged.

That is a much more realistic standard for most alternative investment strategies.

It may also be a more repeatable way to improve model portfolio performance than relying solely on active manager selection inside core equity allocations. Finding active managers who can consistently deliver alpha after fees is difficult. Identifying them in advance and sticking with them through inevitable periods of underperformance is even harder.

By contrast, using capital-efficient ETFs to preserve core exposures while adding diversifying return streams is a portfolio construction decision. Instead of finding one manager who can beat the market every year, advisors can build a portfolio with more than one way to generate returns.

Figure 3: Capital-Efficient Portfolio Construction Delivers Diversification Without Sacrificing the Core

Real Portfolio Example

Start with a traditional 60/40 ETF portfolio. Now make the core exposure more capital efficient.

Figure 4: Example Portfolio: Using Capital Efficiency to Add Diversifying Return Streams

In this example, we use the WisdomTree US Efficient Core Fund (NTSX) as the core holding. Because NTSX provides stock and bond exposure in a more capital-efficient structure, it creates room in the portfolio for other diversifying return streams.

We use that freed-up space to add alternatives through a combination of the WisdomTree Managed Futures Strategy Fund (WTMF) and the WisdomTree Enhanced Commodity Strategy Fund (GCC).

The goal is simple: keep the familiar 60/40 foundation, but use capital efficiency to expand the opportunity set.

Using January 2019 as the starting point, which corresponds with the inception date of NTSX, the results show how this approach can help investors add diversified return drivers while maintaining a similar volatility profile.

Figure 5: Capital Efficiency Expanded Return Drivers While Maintaining a Similar Risk Profile

As demonstrated in this example, capital efficiency does not have to mean taking significantly more risk. It can mean making the same risk budget work harder.

Stocks remain the long-term growth engine. Bonds can provide income and potential ballast. Alternatives can add exposures tied to different market environments. Capital-efficient ETFs can help make room for all three.

That is the next step beyond 60/40: not abandoning the traditional portfolio but using capital efficiency to build more around it.