Production (and consumption) of agricultural plant commodities has a diverse geographical distribution. Along with climate and corresponding types of vegetation, the economy of a nation also influences the level of agricultural production. Production of some products is highly concentrated in a few countries while other are widely produced. For instance, China, the leading producer of wheat and ramie in 2013, produces 6% of the world’s ramie fiber but only 17% of the world’s wheat. Products with more evenly distributed production see more frequent changes in ranking of the top producers.