有條rule: the derivatives should only be used for liquidity purpose; or as a short term substitute for physical holdings; or to reduce market exposure prior to sale of equivalent physical securities
這個能不崩說成是derivative must be covered by cash & equivalents???
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derivatives should be used to hedge risks and not for long-term investing or speculating purposes. It needs to be considered a risk management tool in your overall portfolio or holdings, not as income sources.