What principle is transactions are between equals or up and down?

The principle that transactions occur between equals or in a hierarchical manner—often referred to as "transactions between equals"—suggests that exchanges are most effective when both parties perceive themselves as having equal standing or influence. Alternatively, in up-and-down transactions, one party holds a superior position, which can impact the dynamics and fairness of the exchange. This principle emphasizes the importance of mutual respect and perceived balance in negotiations and transactions to foster trust and cooperation.