Efficient asset allocation

Different asset classes rarely move in lockstep. Equity, debt, gold and real estate each answer to different economic forces, so their returns rise and fall at different times, by different amounts.

An efficient asset allocation takes advantage of that. It combines asset classes whose returns have low, or even negative, correlation with each other — meaning that when one is down, another is often flat or up.

The payoff is a smoother overall portfolio, not necessarily a portfolio with the single highest possible return.

The mechanism is correlation, not any single asset's own return. Holding two assets that always move together adds no protection — a fall in one is a fall in both. Holding two assets with low or negative correlation means a fall in one can be offset, wholly or partly, by a rise or a smaller fall in the other.

The workbook's own illustration: during the 2007–09 recessionary period, equity markets in many countries performed poorly, while gold prices rose. An investor who had split their money between gold and equity earned a better combined outcome than one who had put everything into equity alone — not because gold "won," but because the two assets were not falling together.

Some international research the workbook cites goes further: asset allocation and investment policy, not the selection of individual securities within one asset class, explain more of a portfolio's overall performance.

Two investors each start with Rs 20,00,000 at the beginning of a downturn.

Investor A holds it all in equity. Equity falls 25% during the period. His portfolio is now worth Rs 15,00,000 — a loss of Rs 5,00,000.

Investor B splits the same Rs 20,00,000 as 70% equity, 30% gold. Equity still falls 25%, taking his equity slice from Rs 14,00,000 to Rs 10,50,000. But gold, moving the other way, rises 20%, taking his gold slice from Rs 6,00,000 to Rs 7,20,000.

Investor B's portfolio = 10,50,000 + 7,20,000 = Rs 17,70,000

Investor B lost Rs 2,30,000 against Investor A's Rs 5,00,000 — not because gold beat equity outright, but because the two assets did not move together, which is exactly what an efficient asset allocation is built to exploit.

Chapter 18 (Risk Profiling for Investors), section 18.3.1, "Investor's risk profile with the asset allocation," defines efficient asset allocation directly in terms of low or negative correlation and gives the 2007–09 gold-versus-equity illustration. Expect a question distinguishing "efficient" allocation (a correlation-driven concept) from strategic, tactical or dynamic allocation (which describe how and when the mix is set or changed), or a scenario question asking why a mixed portfolio outperformed a single-asset one in a downturn.

• "Efficient" here is about correlation between asset classes, not about picking the single best-performing asset. A portfolio can be efficiently allocated and still contain an underperforming asset class.
• Do not confuse this with the efficient market hypothesis — a completely different concept about how prices reflect information, not about diversification.
• The benefit depends on genuinely low or negative correlation. Combining two assets that move together in the same direction is not efficient allocation, whatever the labels on the assets are.
• This is a property of the mix, not a fourth "type" of asset allocation alongside strategic, tactical and dynamic — those describe the process of setting or changing the mix; efficiency describes the quality of the mix itself.