ComradeCash was removed in update Alpha.1836 as the game's business model was changed from free to play to a traditional buy once - get everything-model.

What it was Edit

Screenshot (638)

This is the ingame-button which redirected you to the official premium shop to get more CC

ComradeCash (short: CC) was a premium currency of March of Industry. You were only able to use it to buy stuff from the world market.