List and briefly explain the main revenue sources for the portal business model.

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The main revenue sources for the portal business model are:

• Providing ISP services such as Web access and email services for a monthly fee

• General advertising such as charging for the number of banner ad impressions delivered

• Tenancy deals whereby companies that value having access to their audience will lock in long-term multiple-year deals in which they are guaranteed a certain number of impressions with premium placement on home pages and through exclusive marketing deals, for example, subscription fees

• Charging for premium content

• Garnering commissions on sales that are generated from consumers originating from the portal site



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