These and other papers out of the same group in Stockholm
invoke the name "Parrondo" but do not construct actual
Parrondo games.
I have attached the original note from Nature. You will note
that Parrondo game "B" is composed of two sub-games,
one of which has to have a positive expectation. So the
Parrondo two game paradox actually consists of three games.
It is not applicable to trading because if you have three
uncorrelated games, one of which is a winner, you are
better off just playing the winner combined with cash
rather than with one or both of the losing games.