Liquidity fragmentation

Liquidity fragmentation is what happens when money is scattered across systems that do not talk to each other. The same dollar cannot be in two places at once, and in today’s financial plumbing it often cannot even move easily between two places, because each system, each currency, and each ledger keeps its own separate record. To be ready to pay in every place you might need to, you have to hold a funded balance in each of them. Capital that could be working sits idle instead, spread thin across the network.

Why the plumbing fragments liquidity

The BIS has described the structural cause directly. Digital money and other claims, it notes, reside in siloed proprietary databases located at the edges of communication networks, and these databases have to be connected through third-party messaging systems that send messages back and forth. That description fits correspondent banking exactly: the money sits in one bank’s ledger, the instruction travels separately by message, and settlement happens by adjusting balances across a chain of intermediaries.

Fragmentation runs along several lines at once. Money is split across currencies, each settling in its own system and time zone. It is split across venues and ledgers, each a separate silo. And the instructions are split from the money itself, bridged by messaging rather than settled in one place. The BIS has also observed that private tokenisation efforts have themselves been hampered by the silos erected by each project, so newer infrastructure can fragment liquidity just as the old plumbing does if it is built in isolation.

The cost, and the proposed fix

Fragmented liquidity is not only an elegance problem. It is a cost. When funds cannot be reused across systems, institutions pre-fund balances in advance, hold nostro accounts in currencies they do not issue, and reconcile positions across separate ledgers. Each of those is idle capital or operational overhead created purely by the fact that the systems are not connected.

The BIS’s proposed answer is a unified ledger: a financial market infrastructure that combines central bank money, tokenised deposits, and tokenised assets on one programmable platform, so that transactions which currently cross several silos can settle in a single place. It is a blueprint rather than a product, and the BIS is careful to allow for multiple ledgers interlinked by interfaces as an alternative to one unified system. Either way, the direction is the same: connect what is fragmented so that liquidity can be used where it is needed instead of pre-positioned everywhere it might be.