In a marketing research project to determine if a new line of hair coloring products is cannibalizing another brand made by the same manufacturer, which of the following would be a source of information for an informal investigation?

Question

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All the options listed (consumers, competitors' ads, retailers, and ad agencies) can provide valuable insights into whether a new product line is cannibalizing sales from another brand by the same manufacturer, making them relevant sources of information for an informal investigation.

In a Marketing Research Project to Determine If a New