The buy-side companion to Realistic Market Demand. Input prices — fuel, fertilizer, lime, herbicide, seed, water — shift from month to month instead of sitting still, so refuelling and resupplying cost more some seasons than others.
Status: in development (v0.1). Monthly price drift is working. Purchase pressure ("buy a lot of one input this month, pay more for it") is the next piece — see Open questions.
This is the important bit, and it's why the mod composes instead of conflicting: RIM never asserts a price level. It captures whatever price is in your game at load — vanilla, or another economy mod's override — and multiplies it. So:
- Installed alone, it makes vanilla input prices move.
- Installed with an economy-rebalance mod (e.g. Realistic Economy), it makes that mod's prices move.
No config negotiation, no conflict detection — it just rides on top.
It doesn't hook the game's purchase code (that class isn't readable in the SDK).
Instead it rewrites each input's pricePerLiter once per in-game month — a
documented field that every buy path reads live, so one write covers refuelling
at a station and fertilizer/seed consumed while you work. Confirmed in-game
across all six inputs.
Each month, per category:
price = base × drift(category, month) × pressure(bought this month)
- drift — a deterministic monthly wobble (same every reload; different per savegame), so months differ even if you buy nothing.
- pressure — rises toward a ceiling as your purchases mount, decaying next month. (Wired but dormant in v0.1 until purchase observation lands.)
Strength follows your savegame's economic difficulty — no separate setting:
| Economic difficulty | Price ceiling | Monthly wobble |
|---|---|---|
| Easy | +15% | ±5% |
| Normal | +30% | ±8% |
| Hard | +60% | ±12% |
Tune the numbers in scripts/InputPriceModel.lua (PRESETS).
- Farming Simulator 25 (PC).
- Single-player only. Multiplayer is not supported in this version.
- Composes with economy-rebalance mods by design (see above).
- Shop/dealer purchases (pallets, machinery) are a different subsystem and are out of scope.
See CONTRIBUTING.md. Design rationale and verified engine seams are in docs/SCOPE.md.
CC BY-NC-SA 4.0 — share/adapt with credit, non-commercial, same license. Please don't re-upload to sites that paywall mod downloads.
Farming Simulator 25 and the GIANTS Engine are property of GIANTS Software GmbH. This is an unofficial, fan-made mod, not affiliated with or endorsed by GIANTS.