In an adversarial relationship "the outcome of the deal... is more important than maintaining the relationship over a long-term period" p.7. They can be characterised by poor communication and can be used for one-off purchases but be careful for words in answers such as 'only' and 'always', as these can be misleading; adversarial relationships aren't always for one-off purchases, and communication isn't always poor. The other answer is incorrect (price is more important) because it doesn't describe the relationship, which is what the question asked.