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are the network externalities and the multi-product pricing. This means that there are externalities which haven't internalized among end users and the pricing structure is remarkable rather than the price level in these markets (Rochet and Tirole, 2004, pp.1-2).

What is the Platform?
One of the concepts that should be addressed on two-sided markets is the concept of platform. Without any doubts, it is not possible to reach an agreement by directly coming together for customer groups that are in two different sides of the market. First of all, the transaction costs would be too high for such an agreement. In addition, the free rider problem is likely to be encountered with. That's why any third group can ensure making agreements that will internalize the network externalities that exist between these groups by mediating. The place or the area where the intermediary establishes while doing so is called the platform (Veljonovski, 2006, p.35).

In the table there are examples of two-sided markets, the parties that form the market and the platform providers who mediate these parties to come together:

In all of these examples, the mediator group helps the realization of processes between customer groups and these platform providers can be reviewed in different categories:

Market-Makers
The intermediary in this type of platform provides the agreement of two different customer groups by bringing them together by selling transaction. This type of brokerage trading platform available on the market agreements by provides. The buyers and sellers create these two different customer groups. Auction houses and eBay can be shown as an example of the type of platform (Veljonovski, 2006, p.36).

Audience (Target Market) Constructor Platforms
These platforms bring consumers with advertisers by selling message intended for the target group of customers. Television channels, newspapers and magazines are the best known examples of this type of platform. In these platforms that can be defined as media industries, advertisers are sellers and audience and readers are buyers. While the advertisers want to advertise on the most widely read newspapers and magazines or the most watched television channels in order to achieve their objectives more easily, the buyer group who is interested the content of the advertisement, will be directed to magazines, the newspapers or television channels with a wider range of advertisement (Evans, 2002, p15).

Demand Coordinating Platforms
Demand coordinating platforms do not get different customer groups together by selling transaction or message. These kinds of platforms coordinate the demands of different customer groups through indirect network externalities. The most typical example of these platforms are the computer operating systems that coordinate the demands of the hardware, software manufacturers and computer users (Veljonovski, 2006, pp.36-37).

Externalities in Two-Sided Markets
In two-sided markets, the presence of two different groups of customer cause that the externalities in these markets are seen in a variety of ways.

Firstly, the existence of externalities in the membership that seems as the participation of more consumers in the same platform due to the increase in the number of people on the platform can be mentioned. Membership externalities are positiv