Customer information sources and information derived from analyzing Big Data aggregations are increasingly common tools used by business firms in the development of focused Marketing and Sales strategies. Explain how Big Data files are developed and are used as information sources for company decision-making on product development and competitive marketing and sales strategies. Discuss the possible ethical issues that should be considered when gathering data on customer information and buying behavior.

Please be specific about big data in marketing with couple of examples about ethical issues when gathering data on customer information and buying behavior