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Greedflation Price Checkの包括的な教育ガイドを準備中です。ステップバイステップの解説、数式、実例、専門家のヒントをお届けしますので、もうしばらくお待ちください。
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.
Inflation-Adjusted Price = Old Price × (1 + r)^n; Excess = Current − Inflation-Adjusted
- 1Step 1 — Enter the old reference price (from your memory, receipts, archive.org, or supermarket scanner data)
- 2Step 2 — Enter the current retail price
- 3Step 3 — Enter annual inflation rate for the period (BLS CPI for relevant category, e.g., food = ~5%/yr 2020-2023)
- 4Step 4 — Enter elapsed years
- 5Step 5 — Calculator computes inflation-adjusted price: P_old × (1 + r)^n
- 6Step 6 — Computes actual price increase vs inflation-adjusted (the 'excess')
- 7Step 7 — Labels result: Within Inflation Range (excess <5%) or Likely Greedflation (excess >5% above inflation)
$3 × 1.05^4 = $3.65 should be the inflation-adjusted price. Actual $5.50 is 51% above that — strong greedflation signal.
Underpriced vs inflation — possibly competitive market pressure
$10 × 1.04^4 = $11.70. Actual price is slightly BELOW inflation-adjusted — no greedflation here.
Fast food chains widely publicized record profits 2022–2023 while raising prices — the math supports the claim for many items.
Consumer awareness and budgeting
Journalism / policy analysis investigations
Antitrust research and advocacy
Personal CPI tracking and inflation expectations
Corporate accountability conversations
Economic education and behavioral analysis
Is greedflation real or just inflation?
Both. Genuine inflation (input cost pass-through) accounts for ~40–60% of 2021–2023 price increases per Federal Reserve research. Profit-driven margin expansion accounts for the remainder. Calling it 'greedflation' frames it as moral failing, while economists prefer 'sellers' inflation' to describe the structural mechanism: in concentrated industries, firms can raise prices without losing share when consumers expect inflation generally. Both framings describe the same phenomenon.
How do I find the right inflation rate?
Use BLS Consumer Price Index for your category, not headline CPI. BLS publishes detail like 'Food at home,' 'Food away from home,' 'Apparel,' 'Energy,' 'Transportation.' For 2020–2024: food at home ~5%/yr average, services ~4%/yr, durables ~3%/yr. Don't use 2% (long-run target) for the 2020–2023 period — actual inflation was much higher.
What's the clearest signal of greedflation?
When input costs fall but retail prices stay high. Wholesale beef fell 20% in late 2023 but ground beef retail prices stayed elevated. Wholesale gas prices fell sharply in 2023 but pump prices lagged significantly. PPI (producer prices) vs CPI (consumer prices) divergence reveals margin expansion that pure inflation cannot explain.
Why don't antitrust laws prevent this?
Antitrust focuses on collusion (explicit agreements between competitors), monopoly abuse, and mergers. 'Tacit collusion' — companies raising prices in unison without communicating because they all face the same incentives and can observe each other's prices — is generally legal under current US law. FTC and DOJ have proposed updating antitrust to address concentrated markets more aggressively but progress is slow.
Did greedflation cause the cost of living crisis?
It contributed. The Federal Reserve Bank of Kansas City attributed roughly half of 2021–2022 inflation to margin expansion in concentrated industries; the other half to wage growth, supply shocks, and demand. So greedflation is one significant factor but not the whole story. Wages also rose meaningfully (in nominal terms) — real wage growth was muted because inflation absorbed the gains.
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Compare with raw commodity prices (oil, wheat, beef, coffee, plastic) — when input costs fall but retail prices stay high, that's the clearest greedflation signal. PPI vs CPI divergence (producer prices vs consumer prices) reveals margin expansion that simple price comparison can't show. The Federal Reserve Bank of St Louis FRED database publishes both indices.