When talking about investing, one could often hear the terms "active investing" and "passive investing". Usually, active means selecting investments and making decisions along the way, while passive generally means buying broad market indices and leaving them alone most of the time.
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However, one may look a little deeper than that. Assuming asset allocation remains constant, portfolio management can be looked at from two angles:
Selection: “What do I buy?”
Management: “What do I do with what I have vested?”
Putting these two together, there would be four outcomes as detailed below.
Passive–Passive
Passive selection + passive management.
The investor buys broad-based index funds or exchange traded funds (ETFs) and largely leaves them alone. There is little security selection and little portfolio intervention. Rebalancing, if carried out, is periodic and systematic, perhaps once or twice a year. This is probably the closest to what is commonly called a "set-and-forget" portfolio.
Passive–Active
Passive selection + active management.
The investor uses passive instruments, such as ETFs, but actively manages the portfolio. For example, an ETF may be replaced, cash may be deployed, or the portfolio allocation may be adjusted when the percentages change.
Active–Passive
Active selection + passive management.
Here, the investor actively chooses individual securities but largely leaves them alone afterwards. For instance, an investor may select a group of stocks and real estate investment trusts (REITs) based on certain criteria and hold them for the long term. Rebalancing, if required, is carried out periodically according to a predetermined process.
Active–Active
Active selection + active management.
The investor actively chooses the securities and actively manages them afterwards. Holdings may be added, reduced or replaced based on changing circumstances. Rebalancing is also actively determined rather than carried out at fixed intervals.
A Mix Of Both: Core and Satellite
A portfolio does not have to consist entirely of ETFs or individual securities. The two can be combined through a Core and Satellite approach1.
The core is the central group of financial instruments, typically index ETFs, which forms the main basis of the portfolio. The satellites are individual securities such as equities or bonds, which can be used to enhance the portfolio further.
The idea is to combine the diversification of passive instruments with some individual security selection, potentially enhancing the yield and returns of the portfolio.
For example, an investor could have an equities index ETF as the core and selected individual equities as satellites. The same approach can be used for REITs and bonds, with the ETFs providing the broader exposure while the individual securities provide the additional selection.
Core and Satellite therefore describes how the portfolio is composed, while the four active–passive combinations describe how the holdings are selected and managed.
A Core and Satellite portfolio that is periodically rebalanced according to predetermined rules could be Active–Passive, if the individual securities are actively selected but the portfolio is otherwise managed systematically. If the holdings and rebalancing are both actively reviewed and adjusted, it could instead be Active–Active.
Conclusion
The Bedokian Portfolio can be implemented through all four combinations of active and passive selection and management.
The underlying constant, however, remains the asset allocation. The choice of ETFs, individual securities, or a combination of both can vary, as are the ways the portfolio is managed and rebalanced.
Ultimately, asset allocation, diversification and rebalancing work together to balance return potential and risk.
So, active or passive?
It depends on what one is being active or passive about.
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1 – The Bedokian Portfolio (2nd Ed), p135-137






