The traditional time-based billing model is tough to uphold when developing online campaigns says rich Silverstein co-founder of goodby Silverstein & partners an agency owned by Omnicom the global marketing giant .

全球营销巨头goodby，silverstein&partners的联合创办人 里奇希尔斯坦（richsilverstein）表示，开展在线宣传活动时，很难坚持 按 时间 收费的传统模式。