Portfolio allocation: deciding the weights before it matters

For the members of the Financial Market Club, FSJES

Empirical studies in modern finance (notably the seminal research by Brinson, Hood, and Beebower) demonstrate that asset allocation accounts for more than 90% of the variance in total portfolio returns over time. Stock picking and market timing account for less than 10%.

The fundamental question an investor must answer is not "Which stock will rise tomorrow?" but rather "What fraction of total capital should be allocated to equities, to fixed income, to cash, and to real assets?"

Four drivers of rational asset allocation#

An optimal portfolio allocation is dictated by four objective parameters:

  1. Investment time horizon: Long-term capital (10 to 30 years) can absorb significant temporary equity drawdowns in exchange for compounding growth. Short-term funds needed within 18 months must be sheltered in money-market instruments (OPCVM Monetaires) and short-term Treasury bills.
  2. Loss absorption capacity: Distinct from psychological risk tolerance, this is the mathematical ability to endure a severe decline without being forced to sell assets at a loss. A retired household has a lower capacity to absorb loss than a student entering the workforce.
  3. Liquidity obligations: Regular cash commitments (such as university tuition or operating expenses) require dedicated allocations in cash equivalents.
  4. Institutional and regulatory constraints: In Morocco, institutional investors operate under strict statutory allocation rules.

The Moroccan institutional model: CDG, CIMR, and Insurance funds#

To understand professional asset allocation in Morocco, examine the kingdom's major institutional asset managers:

  • The Caisse de Depot et de Gestion (CDG): Manages national savings (including CNSS pension reserves). CDG balances long-term sovereign development financing, strategic equity holdings in key Moroccan industrial corporations, and substantial allocations to Moroccan Treasury bonds.
  • Moroccan Pension Funds (CMR, CIMR): Allocate between 60% and 75% of reserves into Moroccan sovereign bonds to guarantee predictable cash flows that match future pensioner liabilities, with the remaining 25% to 40% invested in high-dividend listed equities and real estate.
  • Insurance Companies (regulated by ACAPS): Under the Moroccan Insurance Code (Code des Assurances), insurance companies must match technical reserves with qualifying assets: typically a minimum of 50% in sovereign debt, with strictly capped maximum ceilings for equities (typically 30% to 40%) and real estate (OPCI).

This multi-asset mix dampens market shocks: when the Casablanca equity market declines, interest payments from Treasury bonds stabilize overall institutional solvency.

Systematic rebalancing: behavioral discipline#

Over time, price movements cause a portfolio to drift away from its target allocation. If equities rally 40% while bonds yield 3%, a portfolio that began at 60% equity / 40% fixed income may drift to 75% equity / 25% fixed income.

Left uncorrected, the portfolio becomes significantly riskier precisely when equity valuations are most elevated.

Systematic rebalancing requires selling a fraction of the outperforming asset class and buying the lagging asset class to restore baseline target weights. This enforces the discipline of "selling high and buying low" without guessing future market directions.

Moroccan asset managers utilize two main rebalancing approaches:

  • Calendar rebalancing: Restoring weights at fixed intervals (quarterly or annually).
  • Tolerance-band rebalancing: Rebalancing only when an asset class deviates by more than +/- 5% from its target allocation, reducing unnecessary brokerage commissions.

For discussion#

  1. If a 22-year-old student club member and a 65-year-old pensioner each have 200,000 MAD to invest on the Moroccan market, design a rational asset allocation mix for each. Explain the structural reasons for the differences.
  2. Why does ACAPS impose statutory ceilings on equity allocations for Moroccan life insurance companies?
  3. Calculate the trades needed to rebalance a 100,000 MAD portfolio that drifted from 60% equity / 40% bonds to 72,000 MAD equity / 28,000 MAD bonds.

For the members of the Financial Market Club, FSJES.

Sources: Brinson, Hood, and Beebower, "Determinants of Portfolio Performance", Financial Analysts Journal. Bodie, Kane, and Marcus, Investments, chapter 26 (asset allocation). ACAPS, Code des Assurances du Maroc (regles prudentielles d'affectation des actifs). CIMR Rapport annuel de gestion.