Insurance products are distributed both by independent and dependent agents, although the use of independent agents is more costly. The product quality hypothesis states that independent agents provide both insurers and customers with higher service quality and therefore, remain on the market....

Since the 1990s, efficiency and benchmarking analysis has increasingly been used in network utilities research and regulation. A recurrent concern is the effect of environmental factors that are beyond the influence of firms (observable heterogeneity) and factors that are not identifiable...

Insurance products are distributed both by independent and dependent agents, although the use of independent agents is more costly. The product quality hypothesis states that independent agents provide both insurers and customers with higher service quality and therefore, remain on the market....

Since the 1990s, efficiency and benchmarking analysis has increasingly been used in network utilities research and regulation. A recurrent concern is the effect of environmental factors that are beyond the influence of firms (observable heterogeneity) and factors that are not identifiable...