Quote Originally Posted by vfreeman
B cannot call under any circumstance regardless of bet size. He has nothing to win beyond what he puts in regardless of the final 2 cards.
Well, in a sense Player B "expects" to win a fraction of half of the pot on each street, since the pot will be split a percentage of the time. Strictly in terms of expected value, it may make sense to call, for example, a $1 bet on the flop, since the majority of the time the player will be returned much more.