Population

Population measures how many people are living in your empire. You get different empire rank by increasing population. Each population consumes 1 Food per second, whereas requiring 1 Happiness until Stone Era(This happiness demands increase every era from Agricultural Era.). You can increase population limit by building houses, like Shed and Cabin.

When you increase your population, the people's ID needs to be registered, which takes time. There is a Cooldown for the ID registration, which has a time limit of 5h initially. You can reduce the time needed to register each person by developing some new Technologies, and you can increase the time limit with some Great People, like Hamlet.

Empire Ranks
You can attain empire ranks depending on population.

What happens when you get a new empire rank?

 * Food cost for getting a new population increases.
 * Starting from Agricultural Era, limit of Laborers increases.
 * Territory natural expansion rates increase.

Jobs
New registered people are Unemployed. The amount of unemployed people is displayed on the top of the Population tab, between the Population and the Cooldown. You can assign various jobs to these people, and when you want to reassign some of them to other jobs, you simply unemploy them from the current job.

Each job gives you a certain Resource, and the secondary jobs will cost you other resources, making it possible to run out of resources over time.