The price-point elasticity of demand formula is: Ed = P/Q sub d * dQ/Dp, where: P is the price at which you are evaluating the elasticity of demand. Q sub d is the quantity demanded at the point you are evaluating elasticity of demand. dQ/dP is the first derivative of quantity demanded with respect to price.
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â03-10-2013 07:48 PM. In other words, a separate answering machine that you plug into your existing telephone. I know stand-alones are becoming dinosaurs, but we already have enough good phones and don't want to buy a whole new set with ans. machine. I also know there aren't too many of these in existence.