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Cary Grant and Audrey Hepburn thriller slipped into public domain because of a clerical error [via]
From IMDb: "Genre: Comedy / Mystery / Romance / Thriller; Tagline: You can expect the unexpected when they play...'Charade'; Plot Outline: Romance and suspense in Paris, as a woman is pursued by several men who want a fortune her murdered husband had stolen. Who can she trust?"
Economicsts with study almost anything
Abstract: For many products the average price paid by consumers falls during periods of high demand. We use information from a large supermarket chain to decompose the decrease in the average price into a substitution effect, due to an increase in the share of cheaper products, and a price reduction effect. We find that for almost all the products we study the substitution effect explains a large part of the decrease. We estimate demand for these products and show the price declines are consistent with a change in demand elasticity and the relative demand for different brands. Our findings are less consistent with "loss-leader" models of retail competition.