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Autor	Grzegorz Koszela
Tytuł	Analiza portfela rynkowego
Title	The Analysis of Market Portfolio
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Abstract	Specialist bibliography offers an equation of the CML, but no formulae for market portfolio' s risk and return. It is connected with the omission of the equation of hyperbola, illustrating the interdependence between risk and return of a two-element portfolio. Co-ordinates of point C are the key for the selection of a portfolio with a predetermined risk of return from a ·CML. This paper fills in this gap. The paper also illustrates an issue of the short sale. Problems with the application of the above theory to multi-element portfolios consist in the fact that, starting from three-element portfolio, three is no clear equivalent of the equation determining the relation between return and risk. In a market portfolio the fundamental importance is attached to an adequate tangent to the hyperbola, its equation, and a point of tangency with the hyperbola. It means that it is impossible to apply the problem to the case of a portfolio assembled of a range of stocks (at least three) and one kind of bonds. Modifying the notion of a market portfolio by introducing a new notion of the so-called arbitrarily small risk portfolio, the author of this paper has achieved the possibility of a uniform characterization of portfolios assembled from any number of elements. A paper on the subject is prepared for publication.
Cytowanie	Koszela G. (2004) Analiza portfela rynkowego.Zeszyty Naukowe SGGW - Ekonomika i Organizacja Gospodarki Żywnościowej, nr 52: 119-129
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Pełny tekst	EIOGZ_2004_n52_s119.pdf

Autor	Beata Madras-Majewska, Janusz Majewski
Tytuł	Opłacalność produkcji pszczelarskiej w Polsce
Title	The Profitability of Honey Production in Poland
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Abstract	The article treats about bee keeping which is a very important element of agriculture. The most important role of bees in environment is plants pollination. Bee colonies produce honey, propolis, bee wax and bee bred. The situation in bee keeping in Poland was critical in the middle of the eighties. The number of apiaries decreased 4 times whereas the number of bee hives decreased 3 times by the end of the nineties. The biggest problems of Polish bee keeping are small average number of trunks in the apiary as well as beekeepers age. They are usually older people and are keeping bees as a hobby. Almost 60% of apiaries have only 20 bee colonies. Such apiaries cannot become the base of beekeeper family livelihood. Only beekeepers that have at least 1 OO colonies in and out apiary can get income high enough to fully support their families. They also have to sell honeybees' products directly to customers. Based on estimations and calculations authors state that Polish bee keeping has a chance to develop in the future. On one hand Polish beekeepers have a chance to get subsidies from EU as well as from Polish government. On the other hand they also have a possibility to gain profits selling their products.
Cytowanie	Madras-Majewska B., Majewski J. (2004) Opłacalność produkcji pszczelarskiej w Polsce.Zeszyty Naukowe SGGW - Ekonomika i Organizacja Gospodarki Żywnościowej, nr 53: 175-185
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Pełny tekst	EIOGZ_2004_n53_s175.pdf