Escape variants can cause new waves of COVID-19 and put vaccination strategies at risk. To prevent or delay the global spread of these waves, virus mobility needs to be minimised through screening and testing strategies, which should also cover vaccinated people. The costs of these strategies...

The paper gives conditions for effi ciency and ineffi ciency of equilibrium allocations in an overlapping-generations model with a constant rate of population growth and with multiple assets, but without labour. Optimal portfolio choice implies that, for any period and history up to that period,...

This expository note uses Hilbert's "infinite hotel", a hotel where one can always find place for another guest even if the hotel is already full, to illustrate the failure of the First Welfare Theorem in "large-square" economies that have infinitely many participants as well as infinitely many...

For overlapping-generations models with multiple assets and without labour, welfare assessments of equilibrium allocations depend on whether the certainty equivalents of the one-period-ahead marginal rates of return on assets that are held are larger or smaller than the population growth rate....

The paper analyses the role of national central banks (NCBs) in the governance of the European System of Central Banks (ESCB), NCBs are the owners of the European Central Bank (ECB), and their governors dominate the ECB's Governing Council, but in monetary policy operations, NCBs are...

This paper studies the relation between Bayesian mechanism de- sign and the Ramsey-Boiteux approach to the provision and pricing of excludable public goods. For a large economy with private informa- tion about individual preferences, the two approaches are shown to be equivalent if and only if,...