How would you describe a consumer who consistently purchases the same brand?

A consumer who consistently purchases the same brand is best described as brand loyal. Brand loyalty refers to the tendency of consumers to continue buying the same brand's products over time, often due to a positive perception of the brand, satisfaction with its offerings, and an emotional connection. These consumers tend to prioritize their preferred brand over others, even if alternatives are available, which often leads brands to invest heavily in maintaining and enhancing customer satisfaction to reinforce this loyalty.

In contrast, the other options do not accurately depict this type of consumer behavior. A niche market refers to a specific segment of the market that is targeted based on particular needs or preferences and does not inherently indicate a loyalty to a specific brand. Mass market suggests a broad, general audience that consumes products without brand preference, which does not align with the concept of brand loyalty. Advertising is a promotional strategy used to influence consumers but does not define consumer behavior. Therefore, "brand loyal" is the most appropriate term to describe a consumer who consistently opts for the same brand.