Poaceae are dominant are estimated to constitute 40.5% of the land area of the Earth, excluding Greenland and Antarctica. Grasses are also an important part of the vegetation in many other habitats, including wetlands, forests and tundra. The Poaceae are the most economically important plant family, providing staple foods from domesticated cereal crops such as maize, wheat, rice, barley, and millet as well as forage, building materials (bamboo, thatch, straw) and fuel (ethanol). Though they are commonly called "grasses", seagrasses, rushes, and sedges fall outside this family. The rushes and sedges are related to the Poaceae, being members of the order
Less-is-better effect right next to each other, the effect disappears, as people see the true value of both," states one source. "It's just the gifts in isolation that give people a flipped sense of happiness and gratitude." Theoretical causes of the less-is-better effect include: The effect has several practical applications. If a conference speaker thinks that about 50 people will attend his talk, but wants to make it look popular, he should hold it in a small room, with 50 or fewer seats, than a large room with over 100 seats. A chocolatier is better off selling a box containing 24 pieces