This article reveals the reason for specific way of competition law enforcement in markets defined within the context of interrelation between the main and derivative products. Identifying particularities of grounds for aftermarkets definition we provide systematization of various types of interrelations between main product and derivative product taking into account possible cases for two related markets and single one in product boundaries; competition and monopolization of single market, both markets or one of them. The set of competition restrictions problems within the «main product - derivative (supplementary) product» relationship is defined on the basis of studies in the New Institutional Economic theory taking into account the contracting between producers (sellers) and buyers of products mentioned. It is explained significance of such aspects of interrelations between buyers and sellers of complex durable goods as fundamental transformation, switching cost, hold up, contracts incompleteness. Based on lessons learned from «Kodak» and some other cases the issue of limits for efficient antitrust enforcement is discussed. The problem of excessive antitrust enforcement as an substitute of contracts design by private actors demonstrate the risk of crowding out of private ordering of contracts by public ones. The article shows some signs of specific vector of Russian antimonopoly law enforcement related to aftermarkets issues. It is discussed particular case of product boundaries definition of market (stripes for tests to check quantity of sugar in blood) and wider classification of interrelations between the main and derivative products taking into account not only individual market dominance but also collective market dominance.

The article is devoted to the manifestations of monopoly in the insurance market of the Russian Federation. Analyzed historical moments of presence state and commercial monopolies in various stages of development of the Russian insurance market. At the present stage proved the existence of a «niche» (local) monopoly. Identified and described its types: channel monopoly, the species of monopoly, geographic and consumer monopoly. The presence of channel monopoly proven in sales of insurance services through airlines, online travel agencies, tour operators. Species monopoly is described in two directions: innovative species monopoly and factor species the monopoly. Formulated especially geographic and consumer monopoly in the insurance market. Presents an assessment of the further development of «niche» monopoly in the insurance market.It is shown that at the present stage of development of the Russian insurance market has given way to the traditional monopoly of «niche» monopoly, which the Russian insurance market is shown in the form of a monopoly channel, species and product monopoly, geographical monopolies.

The paper presents the conditions of revenue increasing of four standard auctions: English auction, second price sealed bid auction (Vickrey auction), first price sealed bid auction and Dutch auction. Moreover, we studied a number of special models of multi-object auctions developed by foreign researchers for sale of multiple objects: Uniform-Price Auction, Pay-Your-Bid Auction, Multi-Unit Vickrey Auction, Hierarchical Package Bidding Auction, Vickrey-Clarke-Groves, Simultaneous Ascending Auction, Ausubel Auction, Ausubel, Cramton, and Milgrom’s clock-proxy auction, product-mix auction.According to the analysis of the advantages and disadvantages of existing models of standard and multi-object auctions the author have developed and proposed a new model of auction, which is a symbiosis of the English auction and the Vickrey auction. It defines the contract price on the basis of competitors` bids and provides a higher expected revenue to the auctioneer. The advantages of the proposed model` revenue compared to a standard auction models.The developed model of the auction may find successful application in the formation of auction rules in realization of the Federal law of July 18, 2011 № 223-FZ «On procurement of goods, works, services by separate types of legal entities», as well as in finalizing the legislator’s competitive procurement rules in the Federal law of April 5, 2013 № 44-FZ «On contract system in procurement of goods, works, services for state and municipal needs».

The article is devoted to the tactical level of competitive behavior of firms. Author postulates firms competitive tactics as a set of competitive action, grouped in the tactical models, and actually implemented in tactical operations against certain tactical competitors in a short period of time. The author emphasizes that different tactical models implement some competitive strategies of firms, and offers a matrix of types of competitive strategies of market participants and types of tactical models of competitive action.The author shows, that the classification of tactical models of competitive actions in general should follow the classification of types of competitive action (offensive, defensive, combination). So the author identifies tactical model: front and flank attack; deaf, valid and preventive defense; counterattack; guerrilla warfare; retreat; rational self isolation; non-conflict; consent; joint defense and joint offence; and tactical maneuvers.The author understands the tactical maneuvers as a combination of competitive actions of market participants, who considered making any changes in the realization of tactical operations.The article consistently describes and characterizes all offered types of tactical models of competitive action.