This paper relates to the initial public off ering problem and companies' profi tability levels before and after this event. In the presented study, profi tability ratios in the year before initial public off ering increase over the previous year, and then, after the IPO, fall. This confi rms the phenomenon of distorting the level of profi t before the IPO and partially equity dilution after the IPO.

The importance of the central bank and the government conducting their policies has increased recently, with more attention being given to the effectiveness of policy mix. The non-cooperative models of the monetary and fiscal game are frequently employed to study interactions between both authorities. The models assume that the authorities take into account each other's choices when making decisions. It is also important to remember when seeking equilibrium in the non-cooperative models that in the Nash Equilibrium (which is sought in this study) the parties try to come up with the best response to the opponent's decision. The aim of the paper is to present the Nash Equilibrium in a non-cooperative game between the government and the central bank using a non-cooperative model of a fiscal-monetary game (a policy-mix MODEL). This study demonstrates that in the Nash Equilibrium in the model, the budget deficit and interest rate of an EU member state depend on the exogenous data (external to the model), such as inflation target, base inflation and the Maastricht deficit limit. This study is enhanced by an analysis of the government and central bank's sensitivity to the deep parameters of economic variables.

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Some empirical studies show that natural resources and physical capital are likely to be complements in the production process rather than substitutes. What is more, the assumption of substitutability in many theoretical papers leads to some counterfactual conclusions. This paper proposes a simple model of economic growth with complementarity between these two factors of production via energy production. We consider the equilibrium state of this model and derive the conditions necessary to maintain balanced growth of all macroeconomic variables. We also analyze the time to depletion of natural resources when these resources are the main energy source.

This paper considers the complementarity and substitutability of natural resources and physical capital. Unlike existing empirical research, concentrated on the estimation of the elasticity of substitution between energy and capital, the author focuses on macro data and the growth theory approach. The author considers the standard economic long-run growth models with substitutability or complementarity among natural resource use and physical capital in the production process. He derives from these models empirically verifiable theoretical relationships between their rates of growth. The author also uses crosscountry long-run data to obtain an empirical correlation between these growth rates and finds evidence in favour of gross complementarity between the examined factors of production on the macro level in the long run.