Attempts Do No Harm / 1 11. Calculating the price elasticity of supply Maria is a college student who lives in Miami and teaches tennis lessons for extra cash. At a wage of $30 per hour, she is willing to teach 3 hours per week. At $50 per hour, she is willing to teach 7 hours per week. Using the midpoint method, the elasticity of Maria's labor supply between the wages of $30 and $50 per hour is approximately , which means that Maria's supply of labor over this wage range is