Two-tier programs exist in the minority of affiliate programs; most are simply one-tier. Referral programs beyond two-tier resemble multi-level marketing (MLM) or network marketing but are different: Multi-level marketing (MLM) or network marketing associations tend to have more complex commission requirements/qualifications than standard affiliate programs.[citation needed]
Affiliates were among the earliest adopters of pay per click advertising when the first pay-per-click search engines emerged during the end of the 1990s. Later in 2000 Google launched its pay per click service, Google AdWords, which is responsible for the widespread use and acceptance of pay per click as an advertising channel. An increasing number of merchants engaged in pay per click advertising, either directly or via a search marketing agency, and realized that this space was already occupied by their affiliates. Although this situation alone created advertising channel conflicts and debates between advertisers and affiliates, the largest issue concerned affiliates bidding on advertisers names, brands, and trademarks.[39] Several advertisers began to adjust their affiliate program terms to prohibit their affiliates from bidding on those type of keywords. Some advertisers, however, did and still do embrace this behavior, going so far as to allow, or even encourage, affiliates to bid on any term, including the advertiser's trademarks.

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While these models have diminished in mature e-commerce and online advertising markets they are still prevalent in some more nascent industries. China is one example where Affiliate Marketing does not overtly resemble the same model in the West. With many affiliates being paid a flat "Cost Per Day" with some networks offering Cost Per Click or CPM.

Art. 36.- El proceso de la adquisición o contratación dará inicio con la solicitud o requerimiento de parte de la unidad solicitante, debidamente aprobado por la autoridad competente; esta solicitud deberá contener por lo menos los requisitos establecidos en este Reglamento. Este proceso estará fundamentado en el Programa Anual de Adquisiciones y Contrataciones. Cuando se tratare de la adquisición por la modalidad de contratación directa o de llave en mano, lo que dará inicio al proceso será la resolución razonada del Titular de la Institución, por medio de la cual opta por esta forma de contratar, en la que se hará referencia a las razones que la motivan, tomando en cuenta las regulaciones contenidas en la LACAP para cada modalidad.
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