Decision-economics workspace
Price the idea.
Stress the evidence.
Compare a uniform baseline with a user-authored variable-rate scenario, expose every cost and response assumption, find the break-even response, and see when uncertainty changes the economic direction.
01Envelope
02Zones
03Bridge
04Contribution
05Sensitivity
06Evidence
07Export
Price the change, not only the input.
Define the uniform comparison, variable-rate delivery costs, and fixed planning and verification costs. Currency and product units are intentionally user-defined.
Make every response assumption visible.
Area share, variable rate, and low–expected–high yield response are editable by zone. The model never invents or optimizes an agronomic rate.
Follow every contribution to the result.
Input cost, expected revenue change, added application cost, and fixed review costs remain separate instead of disappearing inside one return number.
Uniform input12,000
→Variable input12,600
+Added application600
+Planning + verification1,500
→Expected net change−500
Low response outcome−3,690
Expected outcome−500
High response outcome2,470
Average variable rate105.0
Break-even yield Δ / ha0.123 t
A positive scenario is not a forecast. Taxes, timing, financing, quality, weather, spatial error, machine performance, and opportunity cost may be absent.
Find where the scenario wins or loses.
The table preserves each zone's area, input-cost change, expected revenue change, and net contribution before field-level fixed costs.
| Zone | Area | Rate | Input Δ | Revenue Δ | Margin Δ |
|---|---|---|---|---|---|
| Lower response | 20.0 ha | 80 | −480 | 0 | 480 |
| Conservative | 30.0 ha | 95 | −180 | 330 | 510 |
| Responsive | 30.0 ha | 115 | 540 | 990 | 450 |
| High potential | 20.0 ha | 130 | 720 | 880 | 160 |
Stress the price and response together.
Nine deterministic cells show how the expected scenario changes when output price and yield response are scaled. Multipliers are not probabilities.
The uncertainty range crosses zero; the economic direction is unresolved.
Separate arithmetic from confidence.
Correct arithmetic cannot rescue weak zone, response, price, cost, or verification evidence.
Why should these areas respond differently?
Is the comparison rate and its historic performance documented?
What supports each low, expected, and high yield response?
Does the price include the applicable unit, discounts, freight, and timing?
Is the commodity value tied to a date, quality, and marketing assumption?
Are added planning, equipment, labor, and application costs represented?
Will the result be measured against a valid comparison after application?
EVIDENCE STATEassumption heavy
Document Zone basis.
- assumptions
- 7
- documented
- 0
- field observed
- 0
SCENARIO BASELINENo baseline saved
07 / BROWSER-LOCAL HANDOFFExport the assumptions, not a prescription.
The JSON packet keeps inputs, zone response ranges, calculations, sensitivity cells, issues, and evidence states. It contains no coordinates or machine rates.
Connect the scenario to application and verification.
Continue into variable-rate application, prescription maps, and yield monitoring to understand how a reviewed idea becomes a bounded machine workflow and later evidence.