Elasticity of Demand
Q: If the price elasticity of demand for a good is -0.25, demand is considered elastic.
Did You Know?
The variance of the OLS slope estimator is σ²_u / Σ(X_i - X̄)². It decreases (precision increases) when: (1) the error variance σ²_u is smaller, (2) the sample size n is larger (which tends to increase Σ(X_i - X̄)²), and (3) the variation in X is larger. A larger MSD(X) means more spread in X, which improves precision.
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