# CFA Formulas App

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Own-Price Elasticity of Demand
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$$E^{d}_{p_{x}} = \frac{\%\Delta Q^{d}_{x}}{\%\Delta P_{x}}\ or\ E^{d}_{p_{x}} = (\frac{\Delta Q^{d}_{x}}{\Delta P_{x}})\times (\frac{P_{x}}{Q^{d}_{x}})$$

• $$E^{d}_{p_{x}}$$ – own-price elasticity of demand
• $$Q^{d}_{x}$$ – quantity demanded of good "X"
• $$P_{x}$$ – price per unit of good "X"