The following is an excerpt from a news article. "Mitchell Hora is hoping that carbon farming will eventually pay off for his family farm in southeast Iowa. There are more and more initiatives cropping up that pay farmers for practices that can help save the planet. U.S. Agricultural Secretary Tom Vilsack says these "climate smart" farming systems have the potential to transform rural economics by creating" a series of new commodities for agriculture, and for Iowa. " Hora sad his farm is working with carbon market startups that pay farmers to store carbon. He thinks his family can generate $12 to $18 per acre with their conservation practices. Adam Kiel, the Iowa Soybean Association's director of conservation, says he hopes farmers begin thinking about "environmental yields" along with their corn and soybean production." 1. Pick one economic concept from the last half of the class you think is best illustrated in the excerpt above. 2. Write 3 - 4 sentences explaining why you think that concept applies.