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2SLS estimation agency or direct analysis AUTO Casualty Insurance Coeffi coefficient estimate consumers control group cost efficiencies critical strategic dimensions dependent variable different strategies direct writing system dummy variables economies of scale exclusive agency system explanatory variables firm's firms fleet full-line hypothesis incurred losses independent agency system insurance companies insurance department insurance lines insurance output insurance regulation interaction effects investment gain investment income Joskow liability insurance industry loss adjustment expenses loss ratio mail order system market share change marketing system MS*MSIZ Mutual Insurance national insurers OLS and 2SLS operating scale performance results performance variables present paper present study price level product differentiation property and liability R-Squared rate regulation rating laws regression results Regulation and Performance regulatory variables return to scale scope of business seller concentration selling expenses state-specific strategic groups strategic opportunities strategic variables strategy dummies system and scope Table tegic tion total expenses underwriting profit