Board Thread:Game Discussion/@comment-37157068-20200207220412/@comment-27170954-20200208132023

Over utilization of the constrained resource is the primary driver of revenue for the developers. Optimal currency management is the only real way to minimize that impact. The most conservative choice is to favor a high M$ balance over upgrading/buying additional cars until the resource demands of the next release are known. Save your money and plan for the future - just like real life.