# Cities and sets

Cities minting and burning pricing follows a linear bonding curve.

The specific pricing formula depends on its set and the amount of units in circulation.

<table><thead><tr><th>Set</th><th width="146">Cities</th><th width="115">Minting initial price</th><th width="218">Minting/Burning price</th><th width="177.5390625">Base rent cost</th></tr></thead><tbody><tr><td>Red</td><td>Baghdad<br>Caracas<br>San Francisco</td><td>0.25 INIT</td><td>INIT = 0.001n + 0.25</td><td>0.01 INIT</td></tr><tr><td>Brown</td><td>Pyongyang<br>Karachi<br>Jakarta</td><td>0.5 INIT</td><td>INIT = 0.002n + 0.5</td><td>0.02 INIT</td></tr><tr><td>Orange</td><td>Rome<br>Buenos Aires<br>Istanbul</td><td>1 INIT</td><td>INIT = 0.005n + 1</td><td>0.05 INIT</td></tr><tr><td>Light Green</td><td>Barcelona<br>Paris<br>London</td><td>1 INIT</td><td>INIT = 0.005n + 1</td><td>0.05 INIT</td></tr><tr><td>Green</td><td>Seoul<br>Zurich<br>New York</td><td>2 INIT</td><td>INIT = 0.01n + 2</td><td>0.1 INIT</td></tr><tr><td>Blue</td><td>Dubai<br>Singapore<br>Tokyo</td><td>4 INIT</td><td>INIT = 0.05n + 4</td><td>0.2 INIT</td></tr></tbody></table>

*Where n = amount of units in circulation*

**Seasonal cities**

Each set of cities contains a seasonal city that is destroyed at the end of each season and reset.\
Seasonal city units that are not burnt by their owners before the end of a season are destroyed.

Seasonal cities are the second of each set: *Caracas, Karachi, Buenos Aires, Paris, Zurich and Singapore.*

**Minting and burning**

As explained above, the circulating supply of each city is used for the minting and burning pricing.

If Seoul has a 10 supply, the following will be applied:

* If a new user mints a unit of Seoul -> Minting price = (0.01\*10) + 2 = 2.1 INIT
* If a holder of Seoul burns a unit -> Burning price = (0.01\*9) + 2 = 2.09 INIT

**Protocol fee**

A 5% protocol fee is applied when minting and burning units (in INIT).

This protocol fee is sent to the Civitia DAO treasury address and the proceedings will be used towards game development and maintenance of the Civitia ecosystem.

**Set boosts**

When a user mints and holds all three cities (including the seasonal city) of a given set a boost is applied to their rent earnings from all the cities in that set.

Each set of cities gives a x1.05 boost (+5%) that can be accumulated owning multiple sets.

A detailed explanation can be found in [Rent distribution.](https://docs.civitia.org/game-mechanics/rent-distribution)