kmakarski





Opublikowane | Published

  • On welfare effects of increasing retirement age | Journal of Policy Modelling ()

    We develop an OLG model with realistic assumptions about longevity to analyze the welfare effects of raising the retirement age. We look at a scenario where an economy has a pay-as-you-go defined benefit scheme and compare it to a scenario with defined contribution schemes (funded or notional). We show that, initially, in both types of pension system schemes the majority of welfare effects comes from adjustments in taxes and/or prices. After the transition period, welfare effects are predominantly generated by the preference for smoothing inherent in many widely used models. We also show that although incentives differ between defined benefit and defined contribution systems, the welfare effects are of comparable magnitude under both schemes. We provide an explanation for this counter-intuitive result.

    An earlier version of this text was circulated under a title "Does social security reform reduce gains from increasing the retirement age?". This earlier version was coauthored by Karolina Goraus.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
  • Illusory Gains from Privatizing Social Security when Reform is Politically Unstable ()

    With compulsory funded public social security systems, pension savings constitute a large stock of assets. In this paper we consider an economy populated by overlapping generations, which may decide about abolishing the funded system and replacing it with the pay-as-you-go scheme (i.e. unprivatizing the pension system). We compare politically stable as well as politically unstable reforms and show that even if the funded system is overall welfare enhancing, the cohort distribution of benefits along the transition path may turn privatizing social security politically unsustainable.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
  • Analyzing the effciency of the pension reform: the role for the welfare effects of fiscal closures ()

    Pension system reforms involve fiscal consequences. In practice, a variety of fiscal closures may be implemented, while not all of them involve the same extent of distortions. This paper develops an overlapping generations model to analyze the case of a shift from pay-as-you-go defined benefit system to a partly funded defined contribution system. We calibrate the system to mimic the economy of Poland, which actually implemented such reform in 1999. We analyze the efficiency of the reform with two main closure types: public debt and taxes. Regardless of the fiscal closure scenario this particular reform seems to be efficient in terms of welfare and enhances economic performance. Comparing the welfare of various closures we find that while labor taxation yields relatively higher welfare gain, public debt closure involves least need for the redistribution if capital pillar is to be implemented.

    Jan
    Hagemejer
    Krzysztof
    Makarski
    Joanna
    Tyrowicz
  • Reforming retirement age in DB and DC pension systems in an aging OLG economy with heterogenous agents ()

    We analyze the effects of increasing the retirement age in two economies with overlapping generations and within cohort ex ante heterogeneity. The first economy has a defined benefit system and the second economy is in transition from a defined benefit to a defined contribution. We find that if increase in the retirement age is phased in a way that allows agents to adjust, welfare is not reduced and welfare effects have a similar magnitude and between cohort distribution in both types of the pension systems.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
    Marcin
    Bielecki
  • Unprivatizing the pension system: The case of Poland | Applied Economics ()

    In many countries, the fiscal tension associated with the global financial crisis brings about the discussion about unprivatizing the social security system. This article employs an Overlapping Generations model to assess ex ante the effects of such changes to the pension reform in Poland from 1999 as implemented in 2011 and in 2013. We simulate the behaviour of the economy without the implemented/proposed changes and compare it to a status quo defined by the reform from 1999. We find that the changes implemented in 2011 and in 2013 are detrimental to welfare. The effects on capital and output are small and depend on the selected fiscal closure. Implied effective replacement rates are lower. These findings are robust to time inconsistency. The shortsightedness of the governments imposes welfare costs.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
    Jan
    Hagemejer
  • Small assumptions (can) have a large bearing: evaluating pension system reforms with OLG models ()

    The objective of this paper is to inquire the consequences of some simplifying assumptions typically made in the overlapping generations (OLG) models of pension systems and pension system reforms. This literature is largely driven by policy motivations. Consequently, the majority of the papers is extremely detailed in the dimension under scrutiny. On the other hand, complexity of general equilibrium OLG modeling necessitates some simplifications in the model. We run a series of experiments in which the same reform in the same economy is modeled with six different sets of assumptions concerning the shape of the utility function, time inconsistency, bequests? redistribution, labor supply decisions and internalizing the linkage between social security contributions and benefits in these decisions as well as public spending. We find that these assumptions significantly affect both the size and the sign of the macroeconomic and welfare measures of policy effects with the order of magnitude comparable to the reform itself.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
    Jan
    Hagemejer
    Karolina
    Goraus
    Marcin
    Bielecki
  • Assessing macro-financial linkages: A model comparison exercise ()

    The recent global financial crisis has increased interest in macroeconomic models that incorporate financial linkages. Here, we compare the simulation properties of five mediumsized general equilibrium models used in Eurosystem central banks which incorporate such linkages. The financial frictions typically considered are the financial accelerator mechanism (convex \spread costs related to firms' leverage ratios) and collateral constraints (based on asset values). The harmonized shocks we consider illustrate the workings and mechanisms underlying the financial-macro linkages embodied in the models. We also look at historical shock decompositions of real GDP growth across the models since 2005 in order to shed light on the common driving factors underlying the recent financial crisis. In these exercises, the models share qualitatively similar and interpretable features. This gives us confidence that we have some broad understanding of the mechanisms involved. In addition, we also survey the current and developing trends in the literature on financial frictions.

    Krzysztof
    Makarski
  • The business cycle implications of the euro adoption in Poland ()

    This article analyses the macroeconomic impact of the loss of autonomous monetary policy after the euro adoption in Poland. Using a two-country Dynamic Stochastic General Equilibrium (DSGE) model with sticky prices and wages, we find that the euro adoption will have a noticeable impact on the magnitude of economic fluctuations. In particular, the volatility of output, interest rate, consumption and employment is expected to increase while the volatility of inflation should decrease. Also, in order to quantify the effect of the euro adoption, we compute the welfare effect of this monetary policy change. Our findings suggest that the welfare cost is not large.

    Krzysztof
    Makarski
  • Monetary policy in a non-representative agent economy: A survey ()

    It is well known that central bank policies affect not only macroeconomic aggregates, but also their distribution across economic agents. Similarly, a number of papers demonstrated that heterogeneity of agents may matter for the transmission of monetary policy to macro variables. Despite this, the mainstream monetary economics literature has so far been dominated by dynamic stochastic general equilibrium models with representative agents. This paper aims to tilt this imbalance towards heterogeneous agents setups by surveying the main positive and normative findings of this line of the literature, and suggesting areas in which these models could be implemented. In particular, we review studies that analyse the heterogeneity of (i) households’ income, (ii) households’ preferences, (iii) consumers’ age, (iv) expectations and (v) firms’ productivity and financial position. We highlight the results on issues that, by construction, cannot be investigated in a representative agent framework and discuss important papers modifying the findings from the representative agent literature.

    Krzysztof
    Makarski
  • Credit crunch in a small open economy ()

    We construct an open-economy DSGE model with a banking sector to analyze the impact of the recent credit crunch on a small open economy. In our model the banking sector operates under monopolistic competition, collects deposits and grants collateralized loans. Collateral effects amplify monetary policy actions, interest rate stickiness dampens the transmission of interest rates, and financial shocks generate non-negligible real and nominal effects. As an application we estimate the model for Poland–a typical small open economy. According to the results, financial shocks had a substantial, though not overwhelming, impact on the Polish economy during the 2008/09 crisis, lowering GDP by approximately 1.5 percent.

    Krzysztof
    Makarski

W toku | Work in progress

  • Evaluating welfare and economic effects of raised fertility ()

    In the context of the second demographic transition, many countries consider rising fertility through pro-family polices as a potentially viable solution to the fiscal pressure stemming from longevity. However, an increased number of births implies private and immediate costs, whereas the gains are not likely to surface until later and appear via internalizing the public benefits of younger and larger population. Hence, quantification of the net effects remains a challenge. We propose using an overlapping generations model with a rich family structure to quantify the effects of increased birth rates. We analyze the overall macroeconomic and welfare effects as well as the distribution of these effects across cohorts and study the sensitivity of the final effects to the assumed target value and path of increased fertility. We find that fiscal effects are positive but, even in the case of relatively large fertility increase, they are small. The sign and the size of both welfare and fiscal effects depend substantially on the patterns of increased fertility: if increased fertility occurs via lower childlessness, the fiscal effects are smaller and welfare effects are more likely to be negative than in the case of the intensive margin adjustments.

    Krzysztof
    Makarski
    Magda
    Malec
  • Political (In)Stability of Social Security Reform ()

    We analyze the political stability social security reforms which introduce a funded pillar (a.k.a. privatizations). We consider an economy populated by overlapping generations and intra-cohort heterogeneity, which introduces a funded pillar. This reform is efficient in Kaldor-Hicks sense and has political support. Subsequently, agents vote on abolishing the funded system, capturing the accumulated pension wealth, and replacing it with the pay-as-you-go scheme, i.e. “unprivatizing” the pension system. We show that even if such reform reduces welfare in the long run, the distribution of benefits across cohorts along the transition path implies that “unprivatizing” social security is always politically favored. We conclude that property rights definition over retirement savings may be of crucial importance for determining the stability of retirement systems with a funded pillar. 


    This paper was originally started as a part of MODELLING project, but with the time, it evolved into a heterogeneous agents framework with ex ante heterogeneity in terms of endowments and preferences.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
    Oliwia
    Komada
  • Welfare effects of fiscal policy in reforming the pension system ()

    Pension system reforms imply substantial redistribution between cohorts and within cohorts. They also implicitly affect the scope of risk sharing in societies. Linking pensions to individual incomes increases efficiency but reduces the insurance motive implicit in Beveridgean systems. The existing view in the literature argues that the insurance motive dominates the efficiency gains when evaluating the welfare effects. We show that this result is not universal: there exist ways to increase efficiency or compensate the loss of insurance, assuring welfare gains from pension system reform even in economies with uninsurable idiosyncratic income shocks. The fiscal closure, which necessarily accompanies the changes in the pension system, may boost efficiency and/or make up for lower insurance in the pension system. Indeed, fiscal closures inherently interact with the effects of pension system reform, counteracting or reinforcing the original effects. By analyzing a variety of fiscal closures, we reconcile our result with the earlier literature. We also study the political economy context and show that political support is feasible depending on the fiscal closure.

    Oliwia
    Komada
    Krzysztof
    Makarski
    Joanna
    Tyrowicz
  • Inequality in an OLG economy with intra-cohort heterogeneity and an obligatory pension system ()

    While the inequalities of endowments are widely recognized as areas of policy intervention, the dispersion in preferences may also imply inequalities of outcomes. In this paper, we analyze the inequalities in an OLG model with obligatory pension systems. We model both policy relevant pension systems (a defined benefit system — DB — and a transition from a DB to a defined contribution system, DC). We introduce within cohort heterogeneity of endowments (individual productivities) and heterogeneity of preferences (preference for leisure and time preference). We introduce two policy instruments, which are widely used: a contribution cap and a minimum pension. In theory these instruments affect both the incentives to work and the incentives to save for the retirement with different strength and via different channels, but the actual effect attributable to these policy instruments cannot be judged in an environment with a single representative agent. We show four main results. First, longevity increases aggregate consumption inequalities substantially in both pension systems, whereas the effect of a pension system reform works to reinforce the consumption inequalities and reduce the wealth inequalities. Second, the contribution cap has negligible effect on inequalities, but the role for minimum pension benefit guarantee is more pronounced. Third, the reduction in inequalities due to minimum pension benefit guarantee is achieved with virtually no effect on capital accumulation. Finally, the minimum pension benefit guarantee addresses mostly the inequalities which stem from differentiated endowments and not those that stem from differentiated preferences.

    Joanna
    Tyrowicz
    Krzysztof
    Makarski
    Marcin
    Bielecki


Mikroekonomia I

Ogłoszenia:


Mikroekonomia II

Ogłoszenia

24 maja zajęcia dla wszystkich grup. Dodatkowe ćwiczenia o 13:20 w sali 301A.

Oglądanie prac z Kolokwium odbędzie się 24 maja w godzinach 11:00-13:00 w Jajku.

Sylabus

Przykładowe I kolokwium.

Wyniki i punkty: wszystkie grupy

Wykłady:

[Wykład 1] [Wykład 2] [Wykład 3] [Wykład 4] [Wykład 5] [Wykład 6] [Wykład 7] [Wykład 8] [Wykład 9]

Ćwiczenia:

[Ćwiczenia 1-2] [Ćwiczenia 3] [Ćwiczenia 4] [Ćwiczenia 5] [Ćwiczenia 6]

[Ćwiczenia 1, zadanie w grupach] [Ćwiczenia 1, Zadania Dodatkowe][Ćwiczenia 1, Zadania Dodatkowe ODP]

[Ćwiczenia 2, zadanie w grupach][Ćwiczenia 2, zadanie w grupach ODP] [Ćwiczenia 2, Zadania Dodatkowe] [Ćwiczenia 2, Zadania Dodatkowe ODP]

[Ćwiczenia 3, zadanie w grupach] [Ćwiczenia 3, Zadania Dodatkowe][Popyt rynkowy][Wymiana i asymetria informacji]

[Ćwiczenia 4, zadanie w grupach] [Ćwiczenia 4, zadania dodatkowe] [Ćwiczenia 4, zadania dodatkowe ODP]

[Ćwiczenia 5, zadanie w grupach] [Ćwiczenia 5, zadania dodatkowe] [Ćwiczenia 5, zadania dodatkowe ODP]

[Ćwiczenia 6, zadanie w grupach] [Ćwiczenia 6, zadania dodatkowe] [Ćwiczenia 6, zadania dodatkowe ODP]

 


Skrypt do Zaawansowanej Makroekonomii

Rozdział 1. Model Solowa

Rozdział 2. Model Ramseya

Rozdział 3. Pojęcie równowagi

Rozdział 4. Modele z pieniądzem

Rozdział 5. Model realnego cyklu koniunkturalnego (RBC)

Rozdział 6. Model NK

Rozdział 7. Optymalna polityka pieniężna

Rozdział 8. Model bezrobocia

Rozdział 9. Wstęp do teorii o frykcjach finansowych

Rozdział 10. Model z ograniczeniem finansowym

Rozdział 11. Model z akceleratorem finansowym

  • Aplikacja szacująca skutki reformy emerytalnej z 1999 oraz późniejszych zmian w systemie emerytalnym (2011 i 2013). Możesz samodzielnie dowolnie modyfikować założenia demograficzne i makroekonomiczne.

Systemy emerytalne

  • Many people think that they are cautious and taking proper care of their future. But the truth is that we do not. The scope of old-age poverty in six Central European countries is simply scary.

  • Ustawodawca (nieumyślnie) skonstruował system emerytalny tak, że jest on stale niezbilansowany. To znaczy, że w budżecie Zakładu Ubezpieczeń Społecznych jest i będzie zawsze za mało pieniędzy na wypłaty należnych emerytur. Brakujące środki musi finansować budżet państwa. Co jest problemem w ustawie o emeryturach i rentach wypłacanych z FUS, na podstawie której działa system emerytalny?

  • Około 70% roczników urodzonych na przełomie lat 1970-tych i 1980-tych otrzyma świadczenie na poziomie emerytury minimalnej. Sfinansowanie tych (niskich!) emerytur i ich waloryzacja będzie wymagało np. podniesienia VAT o  ok. 2pp.

  • Udostępniamy aplikację pozwalającą na samodzielne zreplikowanie (i udoskonalenie) badań GRAPE.

  • Spadną emerytury i dobrobyt. Ograniczenie OFE pozwoli na ograniczenie długu publicznego teraz, obciążając jednocześnie przyszłe pokolenia.