A common language/protocol creates efficiency to allow distributing all components of a transaction. Trust is distributed. Value translation is distributed. Every transaction is composed of a value translation and a temporarily trusted 3rd party to assure the value is transferred.
A common language allows barter and allows currency transactions. The language also describes Time. All transactions take time, so the current reporting of transactions in a receipt does not accurately describe the transaction and how long it took for each side to deliver on their end of the bargain. Finance-types should understand that.
A common language allows individual choice in every transaction. One of the derivatives of a common language is a common peer-to-peer marketplace/exchange described below.