“Ledger” system developed by a young ferret on a bet. It spreads through the web before MarsCo discovers and adopts it. The massive edge this gives to MarsCo and its subsidiary companies, who now effectively control the stable currency of Sol, cannot be overstated.

The Ledger is a series of algorithms that make stock investments on behalf of every corporate citizen in Sol, giving them a form of social security and some protection against the endless microtransactions that are life in Sol. Each citizen is monetized, both product and customer.