Revenue model for Google, Amazon.com and eBay
Google, Amazon.com and eBay is a successful e-commerce websites. Now, we would like to analyze their revenue model on they generate a superior return on invested capital. In e-business, the 5 major revenue models are sales revenue model, transaction fee revenue model, advertising revenue model, subscription revenue model and affiliate revenue model.
Google
Google is the world’s best search engine and unlimited information is stored at its database. People likely “googling” to search the information they wanted, and this features also became the advantages competitive for Google. 99% Google’s revenue is derived from its advertising programs, which are Google AdWords, Google AdSence and Froogle.
Google AdWords
Google AdWords is a pay per click(ppc) advertising program of Google designed to allow the advertisers to present advertisements to the people are looking for information related to what the advertiser has to offer. Google AdWords is actually generating affiliate fees, as Google just charge the fees when internet users click the advertisements links. Besides, there’s no minimum spending requirement as the advertiser can decide the amount to pay for per click advertising. Moreover, whether Google AdWord or AdSense, Google is does not collect advertising fees for a banner.
Google AdSence
Google AdSense is an ad serving program run by Google. Website owners can enroll in this program to enable text, image and, video advertisements on their sites. Revenue is generated on a per-click or per-thousand-ads-displayed basis and the ads are administered by Google. Same as Google AdWords, Google AdSense also generating affiliate fees, but it charge based on per-click or per-thousand-ads-displayed.

Froogle
Froogle is a price engine that makes visitor easy to find information about products for sale online. Froogle is different from most other price engines in that it neither charges any fees for listings, nor accepts payment for products to show up first. Also, it makes no commission on sales. In adiition, Froogle is a engine that help visitors search the products for sale online and no charge any fees.
Get more information from Google advertising program and Google’s revenue model
Amazon.com
Amazon.com is was one of the first major companies to implement online sales and it is successfully popularizing online sales. Now, Amazon ahs became a largest online retailer selling all kinds of merchandise, including books, VHS, DVD, music CDs and MP3s, computer software, video games, electronics, apparel, furniture, food, toys, etc.
The main sources of Amazon’s revenue are sales and transaction fees. The internet users can sold or buy a items directly by a third party through Amazon Marketplace. For any item being sold, Amazon will charge a commission based on the sale price, a transaction fee, and a variable closing fee. Transaction fee is charged at fixed fee, which is $0.99 per transaction and a closing fee varies with the type of trade and item traded.
Apart from that, Amazon also derives revenue from affiliate fees by setting up an affiliate marketing program. Website owners can create an online store on their own site. However, the online store can only sell the items from Amazon store. A referral fees will be paid to the website owner and normally it is in the range of 4% to 10% of the product price.

eBay Whereas eBay is an online auction and shopping website where people and businesses buy and sell a broad variety of goods and services worldwide. eBay generates revenue from the transaction fee revenue model. eBay provides Internet platforms of choice for global commerce, payments and communications to public and charged a transaction fees, such as insertion fees, final value fees, promotional fees and reservation fees.

Google, Amazon.com and eBay provide public a way to run e-commerce businesses. After learning these 3 successful websites, we can briefly know the revenue model for e-commerce websites. So, if we want to advertise, conduct auction or sell our product online, we might able to choose a right channel and understand their fees .
Reference Links:
http://www.organicspam.com/google_revenue_model.asp
http://www.wikinvest.com/stock/Amazon.com_%28AMZN%29
http://www.wikinvest.com/wiki/EBay_%28EBAY%29