Explain customers as a source of primary data with respect to consumer and business markets

What will be an ideal response?

In consumer markets, direct research, using the focus group, ethnographic, or observational techniques, with
customers who purchased products from competitors can be useful to learn why they did so. In business markets,
many companies require customers to sign NDAs (nondisclosure agreements), barring customers from speaking
with competitors about the company's products, thus making this type of research more difficult.