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Mr. Vito Tanzi

The sensitivity (i.e., elasticity and built-in flexibility) of the U. S. individual income tax to changes in national income is of great interest to researchers and policymakers. However, the direct measurement of this sensitivity—that is, the measurement obtained from time-series observations of the relevant variables—has always been difficult, and even at times impossible, because changes in the legal structure of the tax have been too frequent to provide enough observations that relate to the same legal structure to allow statistically significant coefficients to be determined. This was particularly true in the United States before 1954, when the rates were changed frequently; it has also been true since 1963, when important changes occurred in rates, personal exemptions, deductions, and other features. In contrast, during the period between 1954 and 1963, hardly any significant statutory changes occurred in the tax.

International Monetary Fund

This Selected Issues paper investigates the economic importance of institutions in Ukraine, and attempts to quantify the potential benefits of market-friendly structural reforms. The paper reviews some of the key findings of the development-accounting literature, which has tried to explain the significant differences in income that persist across countries. It introduces the stochastic-frontier approach, outlining its key assumptions and strengths, and results obtained with the stochastic-frontier model. The implications of the results for the specific case of Ukraine are discussed. The paper also analyzes external risks and opportunities for Ukraine.