Cost per action
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Cost per acquisition (CPA), also known as pay per acquisition (PPA) and cost per conversion, is an online advertising pricing model where the advertiser pays for each specified acquisition - for example, an impression, click, form submit (e.g., contact request, newsletter sign up, registration etc.), double opt-in or sale.
Direct response advertisers consider CPA the optimal way to buy online advertising, as an advertiser only pays for the ad when the desired acquisition has occurred. The desired acquisition to be performed is determined by the advertiser. Radio and TV stations also sometimes offer unsold inventory on a cost per acquisition basis, but this form of advertising is most often referred to as "per inquiry". Although less common, print media will also sometimes be sold on a CPA basis.
CPA as "cost per acquisition"
CPA is sometimes referred to as "cost per acquisition", which has to do with the fact that many CPA offers by advertisers are about acquiring something (typically new customers by making sales).
Formula to calculate cost per acquisition
Cost per acquisition (CPA) is calculated as: cost divided by the number of acquisitions. So for example, if one spends £150 on a campaign and gets 10 “acquisitions” this would give a cost per acquisition of £15.
Pay per lead
Pay per lead (PPL) is a form of cost per acquisition, with the “acquisition” in this case being the delivery of a lead. Online and Offline advertising payment model in which fees are charged based solely on the delivery of leads.
In a pay per lead agreement, the advertiser only pays for leads delivered under the terms of the agreement. No payment is made for leads that don't meet the agreed upon criteria.
Leads may be delivered by phone under the pay per call model. Conversely, leads may be delivered electronically, such as by email, SMS or a ping/post of the data directly to a database. The information delivered may consist of as little as an email address, or it may involve a detailed profile including multiple contact points and the answers to qualification questions.
There are numerous risks associated with any Pay Per Lead campaign, including the potential for fraudulent activity by incentivized marketing partners. Some fraudulent leads are easy to spot. Nonetheless, it is advisable to make a regular audit of the results.
Differences between CPA and CPL advertising
In cost per lead campaigns, advertisers pay for an interested lead (hence, cost per lead) — i.e. the contact information of a person interested in the advertiser's product or service. CPL campaigns are suitable for brand marketers and direct response marketers looking to engage consumers at multiple touch points — by building a newsletter list, community site, reward program or member acquisition program.
In CPA campaigns, the advertiser typically pays for a completed sale involving a credit card transaction.
There are other important differentiators:
- CPA and affiliate marketing campaigns are publisher-centric. Advertisers cede control over where their brand will appear, as publishers browse offers and pick which to run on their websites. Advertisers generally do not know where their offer is running.
- CPL campaigns are usually high volume and light-weight. In CPL campaigns, consumers submit only basic contact information. The transaction can be as simple as an email address. On the other hand, CPA campaigns are usually low volume and complex. Typically, a consumers has to submit a credit card and other detailed informations.
PPC or CPC campaigns
Cost per click on the other hand is generally used for everything else including, email marketing, display, contextual and more.
Also, pay per download (PPD) is another form of CPA, where the user completes an action to download a specified file.
Tracking CPA campaigns
With payment of CPA campaigns being on an “action” being delivered, accurate tracking is of prime importance to media owners.
This is a complex subject in itself, however if usually performed in three main ways:
- Cookie tracking – when a media owner drives a click a cookie is dropped on the prospect's computer which is linked back to the media owner when the “action” is performed.
- Telephone tracking – unique telephone numbers are used per instance of a campaign. So media owner XYZ would have their own unique phone number for an offer and when this number is called any resulting “actions” are allocated to media owner XYZ. Often payouts are based on a length of call (commonly 90 seconds) – if a call goes over 90 seconds it is viewed that there is a genuine interest and a “lead” is paid for.
- Promotional codes – promotional or voucher codes are commonly used for tracking retail campaigns. The prospect is asked to use a code at the checkout to qualify for an offer. The code can then be matched back to the media owner who drove the sale.
Effective cost per action
A related term, effective cost per action (eCPA), is used to measure the effectiveness of advertising inventory purchased (by the advertiser) via a cost per click, cost per impression, or cost per thousand basis.
In other words, the eCPA tells the advertiser what they would have paid if they had purchased the advertising inventory on a cost per action basis (instead of a cost per click, cost per impression, or cost per mille/thousand basis).
If the advertiser is purchasing inventory with a CPA target, instead of paying per action at a fixed rate, the goal of the effective CPA (eCPA) should always be below the maximum CPA. As described by Yang's Law, eCPA<CPA. This fundamental view of the what the performance of conversion-based campaign should be is served as the baseline for many buy-side platform optimization algorithms.