正自羁怀多感,怕荒台高处,更不胜情。向尊前又忆、漉酒插花人,只座上已无老兵。凄清,浅醉还醒。愁不肯、与诗平。记长楸走马,雕弓笮柳,前事休评。紫萸一枝传赐,梦谁到、汉家陵。尽乌纱、便随风去,要天知道,华发如此星星,歌罢涕零。红颜弃轩冕,白首卧松云。The classic example of pure competition occurs with a commodity, like wheat or corn, that has so many producers that no one of them can control its selling price. |