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Keyword search ads, which account for the largest portion of online e-commerce online advertising, are among the fastest growing online advertising in recent years. Keyword search ads should be more cost-effective than other internet ads since advertising costs can be higher than the effects. In this study, I analyzed the relationship between Click Through Rate (CTR) and product involvement. CTR is a quality index and the higher CTR, the higher the advertisement impact. A researcher analyzed users’ search data provided by Naver to find out the relationship among number of clicks, CTR, and number of keyword’s hits. Using the data, each representative keyword is selected and compared according to the product type. The results of this study show that it is not effective to advertise through most popular keywords, but rather to advertise through optimized keywords. In addition, The effect of keyword search advertising is considered to be dependent on the level of product involvement in consumer behaviour. It is expected to contribute to the extant literature by providing a way of estimating the impact of advertising through the internet by suggesting optimized criteria relative to key word search and CTR.
