Closed Financial Engine - Not in Practice. In Theory
Chapter3
INVESTMENTFUNDING
Diversification Failed in 2008 — Not in Practice. In Theory.
Modern Portfolio Theory tells us: diversify, and you will be protected.
In September 2008, correlations across asset classes converged toward 1.0 — simultaneously.
Equities, real estate, high-yield credit, private equity, commodities.
All moved in the same direction. At the same time.
Diversification did not fail in execution, It failed in its foundational assumption.
The core premise of MPT is that uncorrelated assets protect a portfolio.
But correlation is not a fixed property — it is a conditional one.
Under normal market conditions, assets appear uncorrelated, and under tail-risk events ( correlations converge toward 1.0 precisely when you need them not to)
This is not a new observation (It is well-documented in academic literaturem), What is less discussed is the structural implication:
If the assets that appear uncorrelated in normal markets
become correlated in exactly the conditions that require protection —
then the protection was never structural. It was statistical.
No Portfolio Construction framework has answered this adequately: If true protection requires genuinely uncorrelated returns — where does that uncorrelated return actually come from?
Not from diversifying across assets driven by the same macro factors.
Not from hedging instruments that depend on external counterparties.
But from a system that generates its return from within (independent of market cycles, monetary policy, and geopolitical conditions)
A system whose Beta is not borrowed from the market , But generated by its own internal structure
This distinction (between market-dependent return and internally-generated return ) , is the structural question that current portfolio theory has not resolved.
It is also the question that everything I have built since is designed to answer..
Tariq Alsaleh
#TailRisk #UncorrelatedReturns #PortfolioConstruction
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Saudi Arabia - Riyadh