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Extended Abstract: The mobile business (mbusiness) mode has two sequential phases, mobile commerce (m-commerce) and electronic commerce (e-commerce). The m-commerce phase enables sales promotion by e-shops to galvanize potential customers within their short attention spans. Then, sales transactions are handled by the e-commerce phase. In this paper the dynamic cache size tuning technique, MACSC (Model for Adaptive Cache Size Control), is proposed for shortening the m-business service roundtrip time (RTT). This enhances the quality of service (QoS) that creates happy and return customers. The MACSC core is ) ( * last r current r old new s s CacheSize CacheSize = , which lets the dynamic cache size tuning process maintain the given proxy cache hit ratio on the fly. The popularity ratio (PR) or last r current r s s is "current statistically measured standard deviation current r s of the ranked objects over the last measurement last r s ". Assuming: a) data retrieval roundtrip time (RTT) between the proxy and a client is 1 T (1 st leg); b) the proxy caches the promotion material by e-shops as data objects; c) if the proxy does not have the object, it asks the eshop(s) over the Internet for it and incurs the 2 T delay (2 nd leg); d) the proxy has a given hit ratio of 7 . 0 = α (70%); and e) 2