I'm working through the tutorial videos on Youtube and have a (possibly really silly!) question.
In the ladder view I'm looking at the trading volume column. Does this refer to the amount that has been traded as back bets, lay bets, or both? I'm not quite grasping it at the moment.
Also, the odds flash red, yellow and green. I realise that yellow means that the last bet was placed at the previous odds, but I don't understand what happens with the red and green. For example, if that column were to flash red 100% of the time would that mean the back odds would lengthen, whilst the lay odds would drop? And, conversely, were it to flash green 100% of the time would that mean back odds would drop and the lay would lengthen?
I know markets are a lot more volatile than this, but it's just so I can get my head around the mechanics.

Thanks in advance for any help.