The article considers the tourist multiplier's various classifications based on the materials of domes tic and foreign scientists and researchers. It was found that the tourism multiplier is the ratio of changes in one of the key economic indicators to changes of tourist expenses and is accompanied by a number of other positive trends. Also, it has been determined that the indirect impact of tourism (the multiplica tive effect of tourism) is much wider and deeper in its socioeconomic nature and has a large number of indirect effects, and its combined effect far exceeds the direct economic and social effect. After the research of the works of foreign and domestic authors not only in tourism, but also in other scientific fields, primarily economic theory, as well as for detailed and comprehensive consideration of the content of the tourist multiplier, modern classification of the multiplier effect in tourism and tourist multiplier was proposed, allowing deeper understanding of the essence and significance of the phenomenon under study. Based on proposed classification, criteria were identified, such as the main types, degree of com plexity, direction of action, nature of presentation, scale of manifestation, cause of occurrence, time of development of tourist and recreational activities, forms of tourism, form of presentation and degree of openness of the tourist destination economy.

Complex formation processes of polyelectrolytes with surfactant ions are close model to protein - lipid interactions in living organisms. Furthermore, polymer – surfactant complexes are widely used as stabilizers of industrial dispersions and structurants of soil. When using the polymer-surfactant complexes the hydrophilic-lipophilic balance has the great importance. The interaction of polyacrylic acid with alkylammonium salts of different hydrophobicity: cetyltrimethylammonium bromide, dilaurildimethylammonium bromide and dioctadecyldimethylammonium chloride was studied by potentiometry, spectrophotometry, viscometry and electrophoresis methods. It was established that the complex formation of polyacrylic acid with cationic surfactants is carried out due to the electrostatic interaction between carboxyl groups of the polymer and cations of surfactants, which stabilized by hydrophobic interactions between their non-polar parts. The phenomenon of hysteresis in the change of the reduced viscosity of system surfactant /polyacrylic acid with temperature variation in the range of 20-60 °C was found. The possibility of using the complex formation process for water purification from CTAB has been shown. The degree of purification is 99.6-99.8%.

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