摘要：Number of suppliers, approximation of equal-shares market condition and market share held by in-state sources were calculated to determine diversity of sources for 10 fresh fruits and vegetables in eight U.S. wholesale markets. Specificity of growing conditions is associated with few supply sources, unequal market shares and limited purchases from in-state suppliers. For crops with few sources, lower perishability and greater transportability are correlated with greater balance in market shares. For crops with many supply sources, greater perishability and greater transportability are consistent with large market share from imports. Diversity across all commodities can increase market share for local producers.
关键词：Concentration index;Fruits and vegetables;Source diversity
