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The purpose of the article is to describe methodological approaches to the complex concept of reliability of engineering enterprises in a competitive environment. The concept of enterprise reliability is proposed to include the following areas of analysis: sustainability of economic growth, financial stability, industrial mobility and market stability. Each of the areas under consideration has its own aspects of analysis and indicators. The definitions of the proposed directions have been given, the need for their joint use in determining the reliability of the enterprise has been substantiated. The main content of the study is to analyze each component of the reliability of the enterprise, the proposed system of indicators that determine them, as well as the most favorable trends in the last time to improve the status and reliability of the enterprise. According to the results of the conducted research, the conclusion about the necessity of development of methods of reliability evaluation of engineering enterprises through the levels to create the structure of sectoral development opportunities has been made.

International negotiable financial instrument markets have a high level of electronic trading. It is displayed using the consolidated limit order book, the widening the range of trading orders, smart order routing, high speed access to the market on the basis of latency minimizing. The result of electronic trading is the development of high-frequency trading, the positive features of which are the increase of trading activity and market liquidity, and the reducing of transaction costs. The main drawback of high-frequency trading is the potential negative impact on market stability (software failures, the manipulative incentives of algorithmic strategies, in particular, technical arbitrage, the use of homogeneous strategies, cyber risks). The current system of high-frequency trading requires particular actions from the regulators to overcome information gaps and enhanced monitoring to create a regulatory environment that could take into account both the aspects of supporting market development and its stability through appropriate macroprudential instruments, especially the implementation of the stress testing of the high-frequency algorithms in response to the shocks of various origin, taking into account the aggregate market effect of the mutual influence of different algorithmic strategies.

Construction enterprise economic stability is determined as condition at which there is most coordinated interaction of all activity components(financing, manufacturing, human resources, marketing, investment and management). Construction enterprise stability enhancing may beachieved through the implementation of adaptation programs. A mechanism of the impact on economic stability of individual components is described which makes it possible to increase overall stability of the construction company in different situations.