The Inbound Marketing Economy

It's no wonder that marketing manager roles are hard to fill, considering the job ads are looking for proficiency in a wide range of marketing disciplines including social media marketing, SEO, PPC, content marketing, Google Analytics, and digital marketing. Even job descriptions for specialist roles tend to call for skills in other disciplines. A particular role such as SEO Specialist may call for several skills other than SEO, such as PPC, content marketing, and Google Analytics.
Job titles containing "SEO" had an average salary of $102,000. Meanwhile, job titles containing "social media marketing" had an average salary of $51,000.
https://moz.com/blog/the-inbound-marketing-economy