Decisões de Compra Inadequadas por Falta de Previsão de Demanda Precisa
Definition
The Brazilian mining company case study applied three forecasting methods (Simple Moving Average, Weighted Average, Exponential Moving Average) and calculated Mean Absolute Deviation (MAD) forecast error to validate which model reduced unnecessary spending. Result: R$942,676.38 annual spend without method vs. lower spend with correct method. Decision errors compound: wrong forecasts → wrong orders → rush expedites → inventory shrinkage → compliance/audit issues.
Key Findings
- Financial Impact: R$942,676.38 documented annual loss from poor forecast selection; estimated 20–35% cost premium on rush/expedited freight (typical Brazil logistics markup); average 40–60 hours/month of manual reorder point recalculation in mid-sized OEM operations
- Frequency: Continuous (monthly purchasing decisions vulnerable to forecast error)
- Root Cause: Absence of quantitative demand forecasting models; reliance on manual judgment or static reorder points; lack of cross-departmental data integration (sales/maintenance demand not linked to procurement decisions); tools (ERP/CMMS) not configured to auto-forecast
Why This Matters
Pitch: Brazilian OEMs using manual purchasing waste 15–30% of spare parts budget on wrong-item buys and rush orders. Time series forecasting (Moving Average, ARIMA, or Machine Learning) improves decision accuracy, cutting waste and reducing procurement lead times.
Affected Stakeholders
Procurement Managers, Buyers, Supply Chain Directors, Finance/CFO (budget variance), Maintenance Supervisors (demand input)
Deep Analysis (Premium)
Financial Impact
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Current Workarounds
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Methodology & Sources
Data collected via OSINT from regulatory filings, industry audits, and verified case studies.
Related Business Risks
Desperdício em Estoque de Peças de Reposição por Previsão Inadequada
Perda de Capacidade Produtiva por Falta de Peças Críticas
Sobrecusto por Atrasos em Componentes de Longo Prazo de Entrega
Perda de Capacidade por Engarrafamento em Componentes de Longo Prazo
Risco de Penalidades por Inconsistência em Documentação NF-e / NFC-e em Procurement
Rejeição de Nota Fiscal Eletrônica e Multas SEFAZ
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