And we made them poor (few guesses) in one game and rich (many guesses) in the other. So they experienced scarcity in trying to reconstruct one picture but not the other. Their total earnings depended on their performance on both games: they had to maximize total points earned. Think of it as having two projects, one with a deadline tomorrow and the other a week later. If people were to tunnel, then what they gain in one picture would be offset by worse performance on the other.
