New answers tagged usability
From an SEO point of view it won't make a difference unless the link is classed as link spamming, in other words the page you are linking to does not have anything to do with the current page (or the product you are linking to does not have anything to do with the page). From a UX/UI perspective it is not ideal as a navigation bar should be used for ...
A terrible idea. Unless the URL is rel="nofollow" and has a really important reason to be in your top of page navigation. Follow up: Part of ranking is the choice of quality/authority OUTBOUND links. If the outbound link is RELEVANT to the page context then it should be a "follow" link but in my view not placed in the top nav area.
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