# A single price function for two simultaneous transactions

I am focusing on a scenario where an entity $$A$$ sell a service 1 to entity $$B$$.

Moreover $$B$$ also sell a service 2 to $$A$$.

The utility function of $$A$$ :

U(A)=price from B for service 1-price to B for service 2 + benefit from service 2 ;

while the utility of B is given as

U(B)=price from A for service 2-price to A for service 1 + Benefit from service 1 ;

If I use the same price function for both transactions ; what advantage would I get over two price functions.

Thankyou.