What are the main sources of second-hand data?

Second-hand information mainly comes from two sources: internal and external.

Internal: marketing materials (sales records and market share of different products, different periods, different customers and different distribution channels, etc.). ), business information (purchase orders, purchase orders, delivery notes, sales records, etc. ), statistical data (statistical statements, enterprise sales, inventory and other data), financial data (financial statements, accounting, product prices, costs and other data), customer data (customer files, etc.).

Outside the enterprise: Internet, libraries, professional dictionaries, trade magazines, case studies and papers, statistical data, literature index, computer retrieval service, comprehensive library catalogue, librarians, government agencies, trade associations and chambers of commerce, news media, research institutions and companies, consumer organizations, etc.