> exactly the schematics I need
People will sell schematics with maximum revenue/time, SO it will be the most needed by industrialists at given moment... Sure, there will be some fluctuations, but in general people will sell the schematics according to the industrialists needs. It will be a steady quanta income for the players.
And I love "consumable single use schematics" way much more than "schematics will live indefinitely" way with single-time quanta investment into them. The first one is much more dynamic way, and it provides easier way to newbie player start the industrialist game - the process will not need huge amount of quanta to invest, especially, it will not depend on inflation too much, as it's now.