11. Calculating the price elasticity of supply Deborah is a volunteer fire fighter living in Miami who teaches clarinet lessons to supplement their normal income. At an hourly wage rate of $40, they are willing to teach 9 hours per week. Upping the wage to $55 per hour, they are willing to teach 17 hours per week. Using the midpoint method, the elasticity of Deborah's labor supply between the wages of $40 and $55 per hour is approximately , which means that Deborah's supply of labor over this wage range is