Costs

The costs of buildings scale with each purchase meaning that every purchase increases the price of subsequent purchases for the same building.

Buildings that lie far outside the price range of the player are not visible.

The exact system works as follows.

The game always shows all buildings the player can afford and one building the player can not afford, so as to encourage the player to save up for it. The displayy of buildings available and unavailable updates with each purchase a player makes, utilising the money value the player had before they made the purchase.