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Abstract.One of the problems of the Latvian economy is related to the energy sector. In this sector the increasing competition is related to regional market expansion, building new transmission connection; fuels and electricity market price conjuncture significant change; energy efficiency requirements increasing, renewable energy requirements increasing and new market regulatory mechanisms. The system dynamics model can solve sector competitiveness problems. With the help of the developed model, it has been estimated that increase in total electricity consumption (around 10%) can be expected in Latvia during the next 10 years. Decline in electricity loss and electricity imports is predicted. Increase of the capacity of production means and the amount of the produced energy is being forecasted.

In this paper, present the appropriate tools for the balanced development of maritime and inland waterway transport in Ukraine to ensure the implementation of the country’s economic, social and environmental plans. Using statistical data, the main indicators of the development of waterway transport in Ukraine are systematized, which indicate a lack of a technical base for a high-quality and balanced development of waterway transport in Ukraine, irrational use of the territory and water area of ports, their infrastructure, transport routes, as well as a decrease in business entities, which negatively affects the economy country. This points to the need to stimulate the development of waterway transport to increase the number of jobs, improve living conditions of the population, curb migration processes and retain qualified personnel, unload land transport, and save money on road repairs. Therefore, in order to ensure the implementation of the country’s economic, social and environmental plans, an instrumental-logical model has been developed to ensure the co-evolutionary balanced development of water transport in Ukraine, which is based on the use of institutional, legal, financial, economic and information and communication tools.

Used-car market monitoring was started in 2018, 03 January, when Federal Administrative Court in Leipzig (Germany) allowed cities and communes in Germany to impose bans for diesel cars in order to reduce the level of nitric oxide in the air. This decision can radically change used-car market in the EU, because Germany massive exports used cars to Eastern Europe. The database shows the influence of the Germany Court decision to the used-car market in Latvia, as part of the EU market. The database represents the used-car market monitoring in Latvia during 2018. In Latvia 20–22th. used-car are offered for sale each month. The database reflects the observation dynamics of 12 months. In the observations there are included main used-car characteristics such as price, first registration date, motor cubic capacity, motor type, gearbox type, mileage, color, producer (brand), model, body types, (following) technical inspection data, set (features) of cars and so on.

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