The most numerous sole proprieterships in 2003 were special trade construction contractors with nearly 1.8 million businesses, administrative and support services operators with 1.4 million sole proprieterships, personal and laundry services (1.1. million), and non-store retailers, operating more than one million businesses. Those with the most receipts included special trade contractors ($101.1 billion), residential building construction ($38 billion), investment advice and other investment activities ($37.8 billion), adminstrative and support services ($36.1 billion), and real estate agents, brokers, managers, and appraisers ($34 billion). (See Table 9.7.)
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