A setting that completely disables Inflation, meaning all prices will stay constant throughout the game.
All prices stay constant throughout the whole game with this patch. This way you can easily see how much more profit you are making compared to the recent years.
Inflation is enabled by default. You can disable it through the configure patches -> economy window (versions prior to 0.7.0) or use the following syntax in Openttd.cfg:
[patches] noinflation = true
In versions 0.7.0 and later, Inflation can be disabled by going to Advanced Settings > Economy.