The cobweb theorem is the economic theory on the dynamic equilibrium analysis, which is used not only in agriculture but, when some conditions are fulfilled, on the various markets as well. The theorem assumes, that producers base their current output on the average price which they obtain in the market during the previous year. Some researchers accuse, however, that this theorem simplifies the reality too much, especially while contemporary market is developed and complex. This theorem derives, however, from the agricultural market, where was primary observed in practice. What was quite predictable was the fact, that nowadays influence of farm-gate price value from previous year is statistical insignificant factor on the way to make the production decisions up. This conclusion let us suppose, that producers are conscious market players. Their production decisions are derivatives of other factors. The statistical tools used in this paper it is the correlation analysis with lags for first differences of time series of prices and harvested area of raspberry, chokeberry and black currant.

Maliny stają się istotną ofertą eksportową Polski. Międzynarodowy handel świeżymi owocami jest jednak ograniczany przez ich trwałość i przeważnie odbywa się pomiędzy krajami blisko siebie położonymi. Większa część obrotów malinami przypada na ich mrożonki. Ta grupa produktów jest silną stroną naszego kraju. Dzięki temu Polska systematycznie zdobywa coraz większy udział w rynku. Artykuł ma na celu przeanalizowanie zmian zachodzących w zbiorach i obrotach malinami na świecie. Zidentyfikowani zostaną główni eksporterzy oraz odbiorcy tych owoców jak i wytwarzanych z nich mrożonek. Ponadto określona zostanie pozycja Polski na rynku światowym i unijnym ze wskazaniem najważniejszych konkurentów naszego kraju.

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The aim of the research was to assess the production potential of the vegetable sector, as a factor of competitiveness, in Poland and selected EU countries. The evaluation of vegetable production was based on a comparative analysis of the level and changes in land area devoted to crops, yields, the number of farms and the average area of crops on the farm, the species structure of crops, the level of basic vegetable yields, and the resources of the factors of vegetable farm production from the FADN system. The research has shown that Poland’s high and growing position in vegetable production results mainly from the high acreage of crops, their partially complementary structure, and above all from relatively low labour costs compared to other surveyed EU countries. On the other hand, the improvement of effectiveness is not supported by the large fragmentation of Polish farms, although an increase in the average area of cultivation per farm was observed in the examined period. The research shows that in most of the analysed countries there was still a large fragmentation of vegetable farms. The analysis of vegetable farm inputs (on the basis of FADN data) in selected countries also shows that in the analysed period, a decrease in production factor resources was observed in Poland, Italy and France.

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