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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Stand-alone is an acceptable variant. Advertisement The first known use of stand-alone, which has been for the most part shortened to standalone, occurred in 1966. Standalone is used mostly in technical and business jargon. And The Post does not stand alone, so the meaning of profitability is somewhat different from most newspapers.