There should be two URLs that can be accessed here - the one with the trailing slash and the one without. And in both cases, this should return this same page. This page is really the control for the other pages (the test to see what happens when different content is displayed depending on if the URL ends with a trailin slash or not).
In every experiment it's important to have a control, and in this case it will allow us to see if search engines treat the control pages differently to the test pages.
In theory, search engines should be able to detect that the content here is identical and I'd expect them to filter out one of them - but it can throw up issues from time to time.