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This study seeks to investigate the role of Social Media Advertising, E-Marketing, and Product Quality on Consumers’ Decision to Purchase Nature Cosmetics in North Sumatra-Indonesia partially and simultaneously. The data were analyzed using multiple Linear Regression model and coefficient of Determination. This research leads to the results that variables of Social Media Advertising, E-Marketing, and Product Quality simultaneously have a positive and significant impact on consumers’ decision in making purchases of Nature Cosmetics in North Sumatra-Indonesia and partially the variable of product quality is more dominant in consumers’ decision in purchasing Environment-friendly Cosmetics in North Sumatra-Indonesia. The coefficient of determination (R Square) shows that the variable of Social Media Advertising, E-Marketing, Product Quality is 0,593 or 59.3% while the remaining 40,7% is affected by other factors beyond the scope of this study.

Consumer buying behaviour is the study of individuals, groups, or organizations and all the activities associated with the purchase. This study aims to investigate the influence of commercial advertisement on consumer buying behaviour regarding internet companies in Erbil. The objectives of the study are multi fold, first To adumbrate the profile of the consumers in Erbil for future advertisement campaign, second to critically examine the perception of the consumer about advertisements, third to analyses and explain the new medium of advertisement and its impact, fourth to assess the role of advertisement in case of internet companies to promote their brands. Three internet companies are selected as sample size including Fast link, Newroz and Tishkent data collected via questionnaire by using 5 likers scale. A structured questionnaire was developed and distributed among 80 users of three internet service provider in Erbil, whereas 60 employees answered rightly. Most of the employees showed positive answers that they have influence of advertisement on their buying behavior toward internet services. This thing leads toward rejection of our Ho and acceptance of H1. Those who left behind with less positive answers  main reason were found during survey that was they are with less education  and most of them they are not  aware with usage of smartphone. Related to future research other authors can consider other variables that are not coved under this study.