Concept
Open future
The value of a future in which many possible ways of living remain available, and the space of choice for later generations is not narrowed by the decisions of earlier ones.
From this value follows an asymmetry in how risks are weighed: irreversible decisions demand a higher standard of justification than reversible ones, even at equal expected benefit.
It also explains why synchronism offers no final model of society: such a model would itself narrow the space we think worth keeping open.