I would have to agree beforehand that the share is worth $2, or else I wouldn't have bought it from you at that price. Somehow the share was already $2 before y

I would have to agree beforehand that the share is worth $2, or else I wouldn't have bought it from you at that price. Somehow the share was already $2 before you sold it to me, but you got it for $1, how come? Your example is nonsensical.