Any respondent to a promotional effort whose interest in making a purchase is likely to be high on account of measures (qualifiers) taken to discourage casual responses.
A direct mail marketer may qualify an inquiry by requiring payment of postage; a textbook publisher may require full course information before sending an examination book; a catalog house may ask a nominal charge for a catalog; or an inquirer may be telephoned to establish serious interest.
Synonyms: qualified inquiry, qualified response