Make a difference and then mix!

I agree that there is not a clear distinction between PR and marketing, but there should be!
This could be a failure of PR people themselves: They did not create a definition about PR, which is widely known. In the conscience of publics PR is a term, everybody assumes issues to it, but nobody can clearly and concretely define it. In addition, PR and marketing are mostly citied in the same context, which makes a distinction not easier.

(http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W5W-3YF47SX-3D&_user=241825&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1092686233&_rerunOrigin=scholar.google&_acct=C000014938&_version=1&_urlVersion=0&_userid=241825&md5=0dc44f5fac6d6c0e86f0f070322d58d4)

In my opinion marketing is the general term and the term for corporation´s philosophy as well. At the end both ways aim to make profits but they set different aspects. The philosophy of a corporation is orientated more on the desires and needs of the customers, whereas marketing – when used as general term – refers to advertising, public relations, sales, product placement and more.