In the paper there was presented importance of use of investment preferential credits in microeconomic scale, which means results of investments financed by them on the operation of selected farms, especially on their income. Analysis of empirical data was preceded by a short presentation of theoretical aspects conditioning advantages and disadvantages of use of preferential credits. Conducted researches pointed out that with exception of one year of decrease in production and income on one of the analysed farms, there was a significant increase in these categories in the whole researched period.

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