I've just published version 0.0.12 which comes with two new buildings: The market and the treasury!

The purpose of the market is to supply items for basic consumption to the citizens. Currently only the apple falls into that category. When there are apples in the market, then citizens will automatically consume them, and generate income for you, which you can then find in the treasury.

The treasury's purpose is to collect income/tax/currency, which you get from selling items to citizens. You can grab currency from the treasury, and bring it to universities (introduced in 0.0.9) to fund their research (i.e. produce science packs).

Let me know what you think!