Not necessarily. If you add a 3rd person, C, that also can make $1 alone, but $5 with person A, then person A's worth is somewhere between $2 and $3 if my intui

Not necessarily. If you add a 3rd person, C, that also can make $1 alone, but $5 with person A, then person A's worth is somewhere between $2 and $3 if my intuition is right (i.e. B would need to agree to uneven split to convince A to work with them). This falls under computational social choice field (coalition formation), and is not a straightforward thing to compute.