The correct answer is D . Margin requirements are fundamentally a risk-control mechanism . When an investor purchases securities using borrowed money, leverage magnifies both potential gains and potential losses. CIRO therefore requires a prescribed amount of client equity or collateral to be maintained so that neither the client nor the Dealer is excessively exposed to market movements and credit risk.
Current IDPC Rule 5110 states that the purposes of margin requirements are to ensure that maximum leverage extended to clients is appropriate and to establish baseline market and credit risk requirements for client-account margin lending. Rule 5111 further requires Dealers to obtain and maintain minimum prescribed margin from clients.
In practical terms, if a security declines in value, the investor's own equity absorbs part of that decline before the Dealer's loan becomes fully exposed. If the account falls below the required margin level, additional funds or collateral may be required, and the Dealer may have rights to liquidate securities in accordance with applicable rules and agreements.
A is incorrect because margin regulation is not designed to increase Dealer commissions. B describes a possible investor motivation for leverage, not its regulatory purpose. C is the opposite of the rule: riskier or less marginable securities generally require more investor capital , sometimes up to 100% margin.
Study Guide Reference: CIRE Element 6.10 — purpose and application of margin requirements; IDPC Rules 5110–5113.
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