This is probably one of the dumbest things I've ever asked ever but here goes.

I can’t get my brains (or lack of) around this one.

Using Betfair, if a level stakes backing system has lost say $50, would a laying system using the same selections at the same prices therefore make $50?

I thought it would but I’m not sure because you are then losing large amounts when laying but only losing your $1 stake when backing.

Are they simply a mirror image of each other or am I missing something.

I told you it was a dumb question.

Thanks for any help (once you've picked yourself up off the floor ).