sentences:  The service, construction, and industry sectors are prominent in Madrid's commercial productive structure.According to the "Directorio Central de Empresas" (Central Companies Directory of the INE), Madrid's active businesses stand in third place nationally in terms of numbers as at 1 January 2006.The branches of activity with most active businesses are other business activities, retail trade, construction, wholesale trade, hospitality, property activities, land transport, and pipeline transport.