When a firm’s marginal productivity declines as output increases, then the firm is experiencing​ a. ​Increasing marginal product b. ​Increasing returns to scale c. ​Diminishing returns to scale d. ​Constant returns to scale

China's new 5 percent tax on disposable wooden chopsticks, reflecting concerns about deforestation, has been praised by environmentalists. the move is hitting hard at the japanese, who consume 25 billion set of wooden chopsticks annually. almost all of the chopsticks used in japan come from china. the reuirements for chinese manufacturers of wooden chopsticks to pay the 5 percent tax is a factor in their external environment.