It annoys the crap out of me when businesses try to use "supply price fluctuations" as a basis for why their prices are increasing. A fluctuation must necessarily go *both directions* so if your price never decreases based on market factors, you aren't fluctuating you're just growing the margin.
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Bestie, there isn't a consumer alive who prefers to pay you a larger, dependable price when they could've paid less. Call it a "market discount" on the receipt if you're not sure longevity.