Shoving Question

[RobertJohn]

A hand came up where I spewed off my chips from the button by jamming over the CO with A8s and ~ 14BBs. He had been raising very aggressively and he had folded to raises in previous hands so I’m still undecided about that play (although in the long run it probably isn’t very good).

However, afterwards I had a discussion with a friend of mine about the play. I said I should be more inclined to shove if I was in the BB rather than the button facing a CO open.

He said he would rather shove from the button b/c he wins more due to the blinds in the pot.

I said yeah, but there are also two more players behind you when you shove from the button and it costs less to shove from the BB.

Then we became confused in discussing this last point and the term “sunk cost” was brought up or whatever.

So here is my question:

All else equal, does it cost less to shove from the BB as opposed to the Button over a CO raise?