Not only can information be imperfect but it can be also distributed asymmetrically in the market. Typically sellers know the characteristics of the good they are selling much better than buyers, and might thus be tempted to profit from this informational advantage by selling a poor-quality good at a high price. Similarly, the person commissioning a work or a service is less informed about the details of the technology and the costs of production compared to the one actually doing the work. The latter