Lukas Nord

Lukas Nord

PhD Candidate in Economics

European University Institute

Welcome to my website!

I am a PhD Candidate in Economics at the EUI in Florence, where my thesis advisors are Árpád Ábrahám and Russell Cooper.

My Research Interests cover Macroeconomics with Household Heterogeneity.

Research

Job Market Paper

Shopping, Demand Composition, and Equilibrium Prices

   

This paper studies the implications of equilibrium interactions between the shopping behavior of heterogeneous households and retailers’ price posting. Heterogeneous consumption baskets along the income distribution and higher shopping effort of the poor imply that retailers face different price elasticities depending on their customer base and charge higher markups for goods disproportionately consumed by richer households. First, I formalize this mechanism in a standard model of frictional product markets and derive testable predictions on the shape of price distributions as a function of search effort. Second, I confirm these predictions using supermarket scanner data from the US. Third, I embed the simple framework into a rich incomplete markets model featuring heterogeneous households with non-homothetic preferences as well as endogenous price distributions for multiple varieties. The calibrated model shows that equilibrium interactions between shopping effort, demand composition, and price posting double the contribution of shopping effort to expenditure inequality relative to previous findings. The model also implies that the response of markups to aggregate income shocks crucially depends on the incidence of the shock along the income distribution.




Working Papers

Distributive Effects of Banking Sector Losses

     with Caterina Mendicino and Marcel Peruffo
   

This paper studies the distributive effects of banking sector losses on household consumption and welfare. Using data from the Consumer Expenditure Survey, we document that in response to declines in bank equity returns the consumption of low-income households decreases by roughly twice as much as the average. To understand this result, we develop a heterogeneous-agent model featuring rich income and portfolio heterogeneity and a banking sector subject to financial frictions. The model matches the empirical inequality in consumption responses following a shock to banks’ asset returns. Households at the bottom of the income distribution suffer from losses in labor earnings and from an increase in the cost of borrowing. In contrast, high-income consumers can take advantage of temporarily low asset prices and high future returns and increase their savings to sustain a higher consumption in the medium term. In fact, a fraction of households benefits from distress in the banking sector. A debt-financed asset purchase program can improve welfare, especially for low-income individuals, by dampening the increase in credit spreads and stabilizing investment.


Joint Search over the Life Cycle

     with Annika Bacher and Philipp Grübener
   

This paper studies how the added worker effect - intra-household insurance through increased spousal labor market participation - varies over the life cycle. We show in U.S. data that the added worker effect is much stronger for young than for old households. A stochastic life cycle model of two-member households with job search in a frictional labor market is capable of replicating this finding. The model suggests that a lower added worker effect for the old is driven primarily by better insurance through asset holdings. Human capital differences between employed young and old contribute to the difference but are quantitatively less important, while differences in job arrival rates play a limited role.


Who cares about Inflation? -
    Endogenous Expectation Formation of Heterogeneous Households

   

This paper builds a joint theory of endogenous inflation expectations and consumption-savings choices of heterogeneous households. We introduce imperfect information about future inflation rates in a consumption-savings model and allow households to exert costly effort to reduce uncertainty about future price changes. High wealth households are more exposed to future inflation due to its effect on real interest rates and hence choose to be better informed. The joint distribution of wealth and inflation expectations generated by the model is consistent with key features of the data. The implied consumption response to news about inflation is hump shaped in wealth: Wealthier households pay closer attention and update their expectations more in response to any signal received, but change their consumption less after any given update in expectations due to the income effect of future inflation. We show this mechanism to reduce the on-impact aggregate consumption response to forward guidance policies by up to 55% compared to an attentive counterfactual.