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EN
International economists are divided over whether income inequalities can be explained with the use of an approach known as the Kuznets hypothesis. Some researchers criticize the Kuznets hypothesis while others support it in their reports. According to Kumor, the Kuznets curve (which is the graphical representation of Russian American economist Simon Kuznets’ hypothesis that economic inequality increases over time while a country is developing, and then begins to decrease after a certain average income is attained) accurately reflects income inequalities only when there are distinct processes of change in the economy. The author sets out to check if the Kuznets hypothesis holds true for Poland. The research covered the period of 1974-2007 with two different economic systems: central planning in 1975-1988 and the market economy in 1990-2007. The processes of economic change in both systems were represented by GDP per employee. The author modified Gini coefficients (measures of the inequality of a distribution developed by Italian statistician Corrado Gini) characterizing wage inequalities. He also applied the method of least squares, a standard approach to the approximate solution of sets of equations in which there are more equations than unknowns. The results of the research seem to confirm a modified version of the Kuznets hypothesis, separately for both economic systems, according to Kumor. In the last analyzed year, 2007, the Gini coefficient was close to its maximum value, the author says.
EN
The paper looks at the key economic and social factors that lead to wage disparities and at the same time contribute to economic growth. The author evaluates the influence of wage disparities on Poland’s economic growth in 1985-2006. Kumor measures the uneven distribution of wages with the Lorenz concentration ratio, and he also uses research methods such as a co-integration analysis and an error correction model. The analysis has confirmed the existence of a long-term cause-and-effect relationship between employment, investment, wage disparities and GDP growth.
EN
In our studies, we deal with the estimating of the optimal ranges of earnings – the optimal Gini indexes which are favourable to the maximisation of GDP growth in Poland. We suspect that the optimal Gini coefficients expressing the whole of society’s acceptance of earnings inequalities can increase. In the article, we formulated a hypothesis on society’s habituation to increasing earnings disparities. We verified the hypothesis on the basis of the model of economic growth using data from 1970 to 2007. We carried out econometric studies in two stages. In the first stage, we estimated the optimal Gini coefficients for short subsequent sub-periods. In the second stage, we studied the character of changes in the optimal Gini coefficients. In the studies, we proved the hypothesis on society’s habituation to increasing earnings disparities. The optimal Gini coefficients increase along with the increase of differences in earnings and the increase of the economic level per capita. The growth of the optimal Gini coefficients may be slowed down.
EN
In the article we made an attempt to estimate the impact of structural economic changes on inequalities of earnings in Poland. The processes of structural changes were represented by GDP per one employee. Inequalities of earnings were measured with Lorenz coefficient. Additionally we used a variable, representing the health human capital infant death rate in a thousand living births. On the basis of 19802006 sample we proved Kuznets’ hypothesis about the parabolic impact of GDP per one employee on inequalities of earnings. In the studied period economy was found on the left arm of the parabola. The increase of GDP level per one employee favoured the increase of inequalities. Our estimates resulted in the fact that inequalities of earnings can maximally increase by about 1.4 percentage point. We think that according to Kuznets’ hypothesis inequalities will start to fall when GDP per one employee exceeds 103,000 PLN worth. The studies confirm the negative impact of the human capital measure infant birth rate on inequalities. We hope that this article enables to better understand market mechanisms influencing inequalities of earnings.
EN
In our studies we deal with estimating of the optimal ranges of earnings – the optimal of Gini indexes which are favourable to maximization of the GDP growth in Poland. We suspect that the optimal Gini coefficients expressing the acceptance of the whole of society for earnings inequalities can increase. In the article we formulated a hypothesis on the social habit to increasing disproportions of earnings. We verified the hypothesis on the basis of the model of the economic growth using data from 1970 to 2007. We carried out econometric studies in two stages. In the first stage we estimated the optimal Gini coefficients for short sub-periods being moved increasingly in time. In the second stage, we studied the character of changes of the optimal Gini coefficients. In the studies we proved the hypothesis on the habit of society to increasing disproportions of earnings. The optimal Gini coefficients increase along with the increase of differences in earnings and the increase of the economic level per capita. The growth of the optimal Gini coefficient may be slowed down.
EN
The authors have developed an econometric growth model to estimate an “optimal” diversification of wages. Pay disparities are optimal when they produce the highest rate of GDP growth. An optimal diversification of wages can be calculated by introducing a variable thanks to which the model will measure “parabolic” disparities. The authors advance a hypothesis that there is an optimal level for the diversification of wages. If pay disparities are smaller than optimal, the most creative, hard-working and efficient individuals are insufficiently rewarded and are not properly encouraged to take advantage of their capabilities in contributing to gross domestic product. If wage disparities are greater than optimal, employees with lower qualifications are underpaid. This can be accompanied by feelings of social injustice and a sense of exploitation and impoverishment. This harms interpersonal ties and the relationship between employees and employers, in addition to limiting people’s confidence and reducing social capital. In such a situation, low-paid employees have little incentive to work. They only have enough motivation to satisfy their minimum biological needs and stay above the poverty line. Underpaid employees display insufficient creativity and dedication. The empirical analysis conducted by the authors for the Polish economy applies to the 1986-2004 period. The analysis shows that pay disparities are higher than optimal and have grown steadily since 1999. A statistically significant slowdown in productivity caused by an excessive diversification of wages occurred in 2003 and 2004. At the time, productivity dropped by around 0.5 and 0.8 percentage points respectively.
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