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Diversification : Ne pas mettre tous ses œufs dans le même panier

سلة خمسة قطاعات

Five-sector basket

Why diversify by sector

Putting all your capital in a single stock or a single sector exposes you to concentration risk: if the sector suffers (rate hikes for real estate, cement slump for construction), the whole portfolio follows. Diversification does not guarantee gains — it limits the impact of a bad bet. On Casabourse, where the MASI is dominated by banks and telecoms, a balanced basket reduces correlation with the index.

BVC practical case: we illustrate a pedagogical allocation of 100,000 MAD across five sectors. Open the Casabourse comparator and choose yourself one stock per sector (liquidity, thesis, volume) — the names cited below are study references, not a buy list.

Illustrative sector allocation — 100,000 MAD

Sector Target weight Amount (MAD) Selection criteria Reference example (non-prescriptive)
Telecoms 25 % 25,000 High liquidity, recurring model, readable dividend IAM — compare with other sector lines if available
Banks 25 % 25,000 Market cap, cost of risk, liquidity ATW or BCP depending on your thesis
Materials 20 % 20,000 Construction cycle, debt/EBITDA, margins LHM — check the current cycle
Logistics / ports 15 % 15,000 Recurring activity, moderate volatility Marsa Maroc
Distribution / agro 15 % 15,000 Purchasing power, yield, yield trap Cosumar — read payout and cash flow
Total 100 % 100,000 Five sectors, five distinct economic drivers

One line per sector — the minimum thesis (write it yourself)

  • Telecoms (25 %) — possible defensive anchor; check liquidity and dividend on the Casabourse company page.
  • Banks (25 %) — macro exposure; compare P/E, yield and cost of risk among peers.
  • Materials (20 %) — cycle-sensitive; do not overweight if the sector is late in the cycle.
  • Logistics (15 %) — recurring activities; watch geographic concentration.
  • Distribution (15 %) — attractive yield possible; check payout and organic growth.

What diversification does not do

A basket of five stocks remains exposed to market risk: if the MASI falls 20 %, most lines will follow. Sector diversification reduces the risk that a single stock or sector ruins the portfolio — not systemic risk. Also avoid “false diversification”: five banks (ATW, BCP, CIH, BMCI, CFG) do not diversify — they concentrate.

Rebalancing — when and how

If IAM rises from 25 % to 35 % of the portfolio after a rally, you are overexposed to telecoms. Simple rule: rebalance when a gap exceeds ±5 percentage points from the target. Sell part of the winning line, strengthen underweight lines — or inject new capital without selling.

Check Threshold Action
Max concentration per line 30 % Sell or do not add if exceeded
Gap vs target ±5 points Rebalance (e.g. IAM 30 % → sell 5 %)
Minimum sectors 4 Do not reduce below 4 distinct sectors
Min liquidity (shares/day) 1,000 Avoid illiquid small caps in the core basket

Practice exercise on Casabourse

In the comparator, choose one stock per sector using your criteria (volume, thesis, dividend). Check today’s prices and calculate the number of shares for 100,000 MAD. Write a one-line thesis for each line you keep — if you cannot, that stock does not belong in your basket.

Key takeaways

  • Diversify = limit the impact of a bad bet, not guarantee gains.
  • Example sector weights: telecoms 25 %, banks 25 %, materials 20 %, logistics 15 %, distribution 15 %.
  • Cited tickers (IAM, ATW, etc.) are study references — you choose the lines.
  • False diversification: several stocks from the same sector.
  • Rebalance when the gap exceeds ±5 points vs the target.

Self-check

  1. What are the five sectors in the allocation example?
  2. Why weight telecoms and banks at 25 % each in the illustration?
  3. What is false diversification?
  4. When should you rebalance the portfolio?
  5. Which Casabourse tool should you use to build this basket?