In June 2017, the OECD held a roundtable on competition issues on aftermarkets to compare national approaches to a number of competition issues with respect to aftermarkets. The discussion was supported by expert advisors, written contributions from the participating delegations and the secretariat`s background document. Aftermarkets are markets for the supply of products or services necessary for the use or use of a relatively durable device that has already been acquired. Primary and after-sales markets are very common in the economy. Typical examples are cars and auto parts/repair services, printers and ink cartridges, as well as computers and software, to name a few. Although economists at the Chicago school consider consumers to be theoretically far-sighted and rational, the results of a series of empirical economic literatures emphasize that, in many cases, consumers are very short-sighted compared to the decisions developed. Thus, it is now accepted that post-market monopolization causes potential damage, even if consumers are fully informed of the overall cost of the life cycle with the competitive primary market. Aftermarket refers to the sale of something after it was initially placed on the market for sale. With regard to securities transactions, the aftermarket refers, for example, to the situation in which an investor buys a security from another investor and not from the issuer after its initial issue on the primary market.

It is also called a secondary market. Fixing or pooling aftermarket products with initial equipment could also be the post-marketing strategy. [10] [11] Here is a list of factors that make post-market monopolization more damaging. [7] There are two essential elements of the post-market: the installed base and the lock-in effect. [6] [7] [8] For sufficient demand for after-sales products, it is necessary to have a number of bases installed from initial equipment customers. [9] Lock-in effect or basic opportunism installed refers to the situation in which customers can consume only products derived from the original equipment manufacturer. This term is also commonly used in the automotive industry to guide the market for spare parts, accessories and equipment for the maintenance or improvement of a vehicle after its sale to the consumer. Some states allow insurance companies to use after-sales parts without consumer consent, some states require consumers to be informed that aftermarket parts have been used on their vehicles, some states require consumer approval for the use of after-sales parts, and in some states, the use of aftermarket parts for vehicle repair is prohibited.

It can also be used to refer to any additional market created by a product after the primary market. Unlike the Chicago school, the post-Chicago school argues that after-sales monopolization could adversely affect consumer well-being, as this could justify the following reasons:[7] [8] These two essential installed base and locking effects make after-sales less volatile compared to the primary market and are therefore more profitable. [6] [7] In addition, the Chicago school argues that after-sales monopolization allows producers to invest in improving the quality of their first equipment; Consumers can benefit from quality primary goods at lower prices and overall economic efficiency increases. [2] [3] In the economic literature, the term „post-market“ refers to a secondary market for complementary goods and services 1, or 2) in relation to its primary primary products (initial equipment). [1] [2] [3] In many sectors, the primary market is made up of durable goods, while after-sales consists of consumable or unsustainable products or services. [4] Once a primary product is purchased, consumers must purchase products or services that are compatible with that primary product after they are put on the market.