John and his wife are having trouble communicating and getting along with one another. which type of therapy is most likely to them with their problems

The type of therapy will most likely to help them with their problems is: Couples therapy
Couples therapy is a form of therapy that created to help two people to reconcile their relationship.
In most cases, couples therapy will encourage communication between each partner so they can learn to understand and value each other's effort

Complementary goods. they go together, thats why one price increase and the others demand increases