Which of the following principles is essential for effective portfolio construction?

Diversification across different asset classes is a foundational portfolio-construction principle because asset classes do not normally respond identically to the same economic and market conditions. Combining equities, fixed-income securities, cash and other appropriate investments can reduce the effect that poor performance in one segment has on the portfolio as a whole. The objective is not to eliminate investment risk, which is impossible, but to control unnecessary concentration risk and improve the stability of the portfolio’s risk-return profile.

Option A is incorrect because asset allocation provides the strategic framework for distributing capital according to the client’s objectives, risk profile, investment horizon and liquidity requirements. Flexibility can be maintained through tactical adjustments and periodic rebalancing without abandoning that framework. Option B focuses exclusively on expected return and ignores volatility, correlation, liquidity and potential loss. Option D creates excessive exposure to the performance of one asset or asset class and contradicts prudent risk management.

The CIRO Retail Securities syllabus expressly covers asset allocation, efficient diversification, naïve diversification, issuer and industry concentration, asset-mix strategies and portfolio rebalancing. CIRO’s investor guidance similarly explains that combining assets that are not perfectly correlated can reduce portfolio risk because weakness in one holding may be offset by stability or gains elsewhere.

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