[ioticus]

Duncanish said:
The province will slowly build a unit that needs more resources than are available (or a whole queue of units, if you want). All the resources for the turn go toward paying off the unit. For example, say you're trying to get a unit that needs 48 Resources, but the province only gets 5. Every turn your five resources will be deducted from the cost of the unit. So, after ten turns, you'll have amassed 50 resources, 2 more than needed, and the unit will be recruited.

That's what I thought but it doesn't appear to work that way in my games. Maybe the unrest is too high and I didn't notice it.