Unit Production (UP) is the measure of how many untrained units a realm will generate per day/turn. It is arguably the most important statistic in the game, since this will directly determine possible army sizes, income, covert, and indirectly determine weapon counts as all things requiring naquadah, which these units generate (as do Miners, which are trained from untrained units). This production can never be taken away by enemies. The cost of the next upgrade is always more expensive than the last upgrade. The cost of the next upgrade can be calculated as (Current UP)*5000 + 10000.