Abstract
There are various advertisers in the Internet advertising market. For some of our clients, increasing the inquiries to their services and purchase activities is the main aim of advertising instead of raising product awareness. Amongst them, there are clients who actively use the Internet and others who don't. Investing on digital marketing provides opportunities for business growth for the latter that haven't yet been able to fully utilize the Internet. For the former, ROAS (Return on Advertising Spend) becomes more important.