If you have some experience modeling data for relational databases, you know that many-to-many relationships between different relational entities appear all the time.

如果您有关系数据库数据的建模经验，那么您就会知道不同关系实体之间的多对多关系随时会出现。

youdao

Of course there are many financial interactions between entities in an economy.

FORBES: The War Against Big Banks Is A War Against Your Mind