Forum Moderators: buckworks
Buy red widgets and you get 10% off your order
you have the words "red widgets" link to the red widgets, easy...
Now the same offer says
No discounts apply to blue widgets
Do you have "blue widgets" link to the blue widgets? I can make valid arguments both ways.
It's also giving an additional occurrence of the word "widgets" in anchor text on the page, so in addition to giving a boost to the blue widgets page for that phrase, you'd be adding relevance for widgets to the page the links are on.
Unless using the phrase "blue widgets" would minimize or dilute the page's relevance for "red widgets" I can't see any reason not to.
I still don't see a problem, if people know you have both red and blue widgets on your site in the first place. Either they want one or the other, and connecting up the two with a link, as long as they're closely related, can help with establishing theming for the site.