Yes, every horse can be layed for the same amount, the minimum being $30.

However, as Wesmip1 says in post 2 of this thread it can be open for manipulation (or an unusual market percentage) because of the lack of money in it.

I stated in post 1 of this thread that out of interest I layed every horse in Mackay R6 expecting to lose about 5% whatever won/lost the race, but I was surprised that I would have won on every horse except the fave. That is what prompted me to start this thread. In fact I again layed the field in another race, but every horse turned out to be a loser so I ended that.

However, it appears due to the higher amount of money wagered in England that there may not be this anomaly. I would assume this to be true because of Mark's success there.