The Market for Lemons cars, the dearth of formal credit markets in developing countries, and the difficulties that the elderly encounter in buying health insurance. However, not all players in a given market will follow the same rules or have the same aptitude of assessing quality. So there will always be a distinct advantage for some vendors to offer low-quality goods to the less-informed segment of a market that, on the whole, appears to be of reasonable quality and have reasonable guarantees of certainty. This is part of the basis for the idiom buyer beware. This is likely the basis for the idiom that
Beware of the Dog (Millennium) the role of Frank Black, and of the two lead roles in "The X-Files". "Beware of the Dog" features the first appearance by R. G. Armstrong as The Old Man, a recurring character who would reappear in the two-part episodes "Owls" and "Roosters". Armstrong has been described as "a long-time favorite" of Morgan's. The episode makes use of Bobby Darin's song "As Long As I'm Singing" in a diegetic manner. Darin's music has been noted by "Millennium" resident composer Mark Snow as a hallmark of the works of Morgan and Wong. "Beware of the Dog" marked the pair's first use