and consequently are less highly valued. Content network properties can include websites, newsletters, and e-mails. Advertisers pay for every single click they receive, with the actual amount paid based on the amount of bid. It is common practice amongst auction hosts to charge a winning bidder just slightly more (e.g. one penny) than the next highest bidder or the actual amount bid, whichever is lower. This avoids situations where bidders are constantly adjusting their bids by very small amounts to see if they can still win the auction while paying just a little bit less per click. In order to maximize success and achieve scale, automated bid management systems can be deployed. These systems can be used directly by the advertiser, though they are more commonly used by advertising agencies that offer PPC bid management as a service. These tools generally allow for bid management at scale, with thousands or even millions of PPC bids controlled by a highly automated system. The system generally sets each bid based on the goal that has been set for it, such as maximize profit, maximize traffic, get the very targeted customer at break even, and so forth. The system is usually tied into the advertiser's website and fed the results of each click, which then allows it to set bids. The effectiveness of these systems is directly related to the quality and quantity of the performance data that they have to work with — low-traffic ads can lead to a scarcity of data problem that renders many bid management tools useless at worst, or inefficient at best. As a rule, the contextual advertising system (Google Ads, Yandex.Direct, etc.) uses an auction approach as the advertising payment system. History There are several sites that claim to be the first PPC model on the web, with many appearing in the mid-1990s. For example, in 1996, the first known and documented version of a PPC was included in a web directory called Planet Oasis. This was a desktop application featuring links to informational and commercial websites, and it was developed by Ark Interface II, a division of Packard Bell NEC Computers. The initial reactions from commercial companies to Ark Interface II's "pay-per-visit" model were skeptical, however. By the end of 1997, over 400 major brands were paying between $.005 to $.25 per click plus a placement fee. In February 1998 Jeffrey Brewer of Goto.com, a 25-employee