By writing and selling these options every quarter , covered call funds generate income that typically totals between 3 per cent and 6 per cent of the fund s value every year 通过每季度建立和卖出这些期权，备兑买入基金每年产生的总收益一般相当于基金价值的3 %至6 % 。
By writing and selling these options every quarter , covered call funds generate income that typically totals between 3 per cent and 6 per cent of the fund s value every year 买入期权是一种衍生品，其持有者有权（而没有义务）在未来某个日期，以某个固定的价格买进一只股票。
Covered call funds entered the mainstream at the end of 2005 , when a change in the rules governing funds allowed them to start paying out income they receive from writing calls , rather than reinvesting that income 备兑买入基金于2005年底进入主流投资产品行列，当时监管基金的规定发生变化，允许基金开始派发从沽出买入期权中获得的收益，而不是对收益进行再投资。
