Europa Universalis IV · Progression system
Technology ahead of its expected year
Technology has an expected year of development. The discussion says purchasing a level before that year costs more, while waiting beyond it reduces the technology cost.
How it works
This provides a cost tradeoff between advancing early and conserving monarch points by waiting. The evidence does not quantify the change or describe how it combines with other modifiers, so it cannot support a specific timing formula.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.