Inflation, as in the "real" world, causes prices to go up as time passes. There is a patch for turning this feature off.
- In versions prior to 0.7.0, the patch is controlled from Configure Patches > Economy.
- Versions 0.7.0 and later have this feature under Advanced Settings > Economy.
- You can also edit the openttd.cfg file and use the following syntax to disable inflation:
[economy] inflation = false