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The Greedflation Price Check Calculator compares current product prices to inflation-adjusted reference prices to identify excess increases — the portion of price growth attributable to corporate profit margin expansion rather than input cost pass-through. The calculator: enter old price, current price, BLS-published inflation rate for the period, and elapsed years. Calculator computes Inflation-Adjusted Price = Old × (1 + r)^years, then Excess Above Inflation = Current − Inflation-Adjusted. Greedflation is contested terminology — economists prefer 'sellers' inflation' or 'profit-driven inflation' — but the phenomenon is documented. Federal Reserve Bank of Boston (2023), Kansas City Fed (2023), and ECB (2023) research found 40–60% of price increases during 2021–2023 were driven by corporate margin expansion in concentrated industries (oligopolistic markets where firms can raise prices in coordinated fashion without losing share). The other 40–60% reflects genuine input cost pass-through (oil, supply chain, labor, raw materials). Most obvious greedflation signals: (1) industries with falling input costs but maintained or rising retail prices (e.g., wholesale beef fell 20% in 2023 but ground beef retail rose); (2) record profits coexisting with price increases blamed on costs (Q2 2022 corporate profits hit all-time highs while inflation peaked); (3) divergence between PPI (producer prices) and CPI (consumer prices) — when CPI rises faster than PPI, retailers are expanding margins not just passing costs. The calculator gives consumers and journalists the basic framework to investigate specific products. Limitations to acknowledge: not all 'excess above inflation' is malicious. Genuine reasons prices may rise faster than CPI: input-cost shocks not yet reflected in CPI lag, productivity declines specific to that product, regulatory compliance costs, or quality improvements. Calculator output flags 'Likely Greedflation' for excess over 5 percentage points above inflation, but absolute confirmation requires industry-specific cost data. Best used as a starting point for further investigation, not a verdict.

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1. 1Step 1 — Enter the old reference price (from your memory, receipts, archive.org, or supermarket scanner data)
2. 2Step 2 — Enter the current retail price
3. 3Step 3 — Enter annual inflation rate for the period (BLS CPI for relevant category, e.g., food = ~5%/yr 2020-2023)
4. 4Step 4 — Enter elapsed years
5. 5Step 5 — Calculator computes inflation-adjusted price: P_old × (1 + r)^n
6. 6Step 6 — Computes actual price increase vs inflation-adjusted (the 'excess')
7. 7Step 7 — Labels result: Within Inflation Range (excess <5%) or Likely Greedflation (excess >5% above inflation)

• !Using wrong inflation period (cumulative vs annual — calculator wants annual rate, applies compounding)
• !Using headline CPI instead of category-specific CPI (food vs durables vs services differ significantly)
• !Ignoring genuine input cost shocks (some 2021–2022 price increases reflected real oil/wheat/labor cost rises)
• !Equating 'excess above inflation' with greedflation in all cases — some excess reflects quality changes, regulation, or genuine cost pressure
• !Cherry-picking products where the math supports the narrative (selection bias)