The on-topic help page has links to the economics and bitcoin sites that use http links. I believe that both of these should be https links.
Links in context:
I fixed the links here rather than spread incorrect links. But still wrong on the help page.
I think that moderators can just edit that page. I leave it up to you whether it's better to just do that or to escalate to Stack Exchange staff, possibly for a more general fix.
This seems low priority (the pages automatically redirect from http to https) but easy to fix.