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Returns a queue that yields tuples of the old and new values.，更多细节参见PDF资料
，详情可参考电影
一位住在附近的消费者说，“贾国龙中国堡比麦当劳还贵，小锅牛肉作为‘快餐’量少且又贵，一份米饭居然会要5块。”
NILAY PATEL: How do you manage the prediction markets against that incentive? Because I see that as totally distorting and in most cases negative.，这一点在PDF资料中也有详细论述