Denver. Business. Market research Deriver is center for market research - history of local research firm.. Post Contemporary N 6, 1966 p.lo- 11 National companies use Denver as test market for new products 1970 r. 53 National Demographics, Inc. studies why people buy certain products. 'RMN Ap 18, 1982 p.82 Denver is good testing market for new products. rocky mountain business journal RMBJ Je 21, 1982 p.6-7 Impact Research, Inc. uses novel market research ideas. RMBJ Mr 25, 1985 p.1,16 0