Much is being written (and deservedly so) about the threat Amazon poses to retailers. It's now the #2 US retailer (worldwide sales) growing 24% annually. Less attention is being paid to the threat Amazon poses to brands. Amazon's unrelenting pursuit of dominance has resulted in its growing influence over four of the five factors that drive consumer purchase decisions. And it looks to be positioning itself to compete on the fifth. The following explains the five factors, detai