The red and green indicates profit for me and you, respectively.
I'm currently selling meat for somewhat less than it's worth (and kol meat can be tied to dollar value much the same way BTC can, so it's an objective measurement of worth), and want to highlight that to encourage trade.
'Course it's a moot point right now - naturally as soon as I leave town there's a power outage, and I hadn't yet bothered to configure the server to bring itself online automatically, what with the low odds of there being a power outage while I'm away.
It should be back up Monday evening sometime.