The first chapter investigates the incidence of the so-called hand-to-mouth, or simply HtM, consumers, i.e. households that consume their whole disposable income. Based on existing models, which introduced a two-dimensional analysis of HtM households with respect to their liquid and illiquid...

The third chapter, co-authored with Gyula Seres, delves into the efficiency of mechanism design in the field of public procurement auctions. Using a novel dataset with public contracts for highway construction in Poland, we analyze effects of screening, i.e. rejections of offers that do not...

The second chapter, written together with Michał Ramsza, explores fiscal rules that govern the fiscal policy in Switzerland, Germany and Poland. Using a Monte Carlo simulation, we generate artificial time series of GDP and government revenues that, together with government expenditures implied...