The process of defining these attributes becomes complex when agricultural products undergo some processing. Canned vegetables or soymilk can be manufactured locally, but some of the ingredients may need to be sourced from elsewhere, particularly organic ingredients that are facing shortage in supply. The current market structure encompasses players of widely varying sizes. In the overall baby food market in North America, Gerber dominates with a share of over 80%. Other large food companies, including General Mills and Heinz, offer their own organic products. Consumer studies on baby food have been limited. Several studies focused on estimating an organic price premium using hedonic pricing analysis, while others have estimated demand systems to examine aggregate demand for baby food products. The origin of ingredients focused on domestic or imported status. The scale of manufacturing companies was proxied by stylized brands.