Which of the following directly creates growth in labor productivity?

A specific tax of $1 per unit of output will affect a firm's

A) average total cost, average variable cost, average fixed cost, and marginal cost. B) average total cost, average variable cost, and average fixed cost. C) average total cost, average variable cost, and marginal cost. D) marginal cost only.

At a price of $8 per dozen, Chuy sells 40 dozen homemade tamales per week. When he raised his price to $12 per dozen, he still sold 40 dozen per week. Based on this information, the demand for his tamales is

A) perfectly elastic. B) inelastic. C) perfectly inelastic. D) unit elastic.