Agricultural Economics and Farm Management
Agricultural Economics and Farm Management tests whether you can build a budget, interpret it, and choose between alternatives - the skills a technician needs to advise a holding, not to prepare company accounts.
Key measures
- Gross margin (GM) = gross output (yield × price, plus coupled enterprise-linked support) − variable costs (seed, fertilizer, pesticide, water, casual labour, field-operation fuel). It measures the enterprise, not the farm.
- Fixed costs (depreciation, permanent labour, rent, insurance, machinery overheads) do not change with the enterprise in the short run.
- Farm profit = Σ enterprise GMs − fixed costs.
- Break-even yield = total cost / price; break-even price = total cost / yield.
- Partial budget: compares only the costs and benefits that change between two options.
- Depreciation (straight line) = (cost − salvage) / useful life. It is a cost, not a cash outflow.
- Discounting: NPV = Σ cash flow / (1 + r)^t; choose the highest positive NPV.
Worked example - irrigated potato budget
Yield 30 t/ha at €250/t → output €7,500/ha. Variable costs €4,200/ha → GM €3,300/ha. Fixed costs €1,800/ha → net €1,500/ha. Break-even yield = (4,200 + 1,800) / 250 = 24 t/ha. Reasoning: break-even uses total cost, not variable cost. At €140/t the crop would cover variable costs but still lose money. Reporting only the GM overstates what the farm earns.
Traps
- Putting fixed costs inside the gross margin.
- Confusing cash flow with profit - a loan repayment is cash, not a cost.
- Ignoring opportunity cost (family labour, own land, own capital).
- Using sunk costs as a reason to continue.
- Adding decoupled payments to the crop gross margin; they belong to the farm.
- Comparing €/ha across enterprises of different labour intensity without converting to €/labour hour.