Road price increased

[Marvel]

Why when we make a road the price is increased like this normal price is 50 but now 53 how to make the price not increased what i need to add to my json?

[LightBlue]

Hahaha... I will explain this. translate to english(buat lebih mudah, itu terjadi jika kita membangun sesuatu terlalu banyak hingga membuatnya lebih mahal.) More things someone can tell him or find other people that have this problem. There are so many people that like this.