We develop a multi-sector model of R&D-driven endogenous growth that merges the expanding-variety with the quality-ladders mechanism. The mechanism of expanding variety provides the flow of new firms (new product lines), whilst the mechanism of quality ladders provides the accumulation of...

Neste texto apresento o modelo base da abordagem teórica denominada por New Macroeconomics aplicando-o à tendência secular, aos ciclos económicos e ao crescente endividamento de Portugal. É demonstrado que i) o endividamento crescente prejudica as exportações e favorece as importações e...

We use the framework implicit in the model of inflation by Shone (1997) to address the analytical properties of a simple dynamic aggregate supply and aggregate demand (AS-AD) model and solve it numerically. The model undergoes a bifurcation as its steady state smoothly interchanges stability...

An economy with ex ante markets for future delivery contingent on ex post spot market prices is considered. Since spot prices are publicly observed ex post, this framework bypasses the enforcement problems that may arise as a result of differential information about states of nature....

It is known that the discretization of continuous-time models can introduce chaotic behaviour, even when this is not consistent with observations or even the model’s assumptions. We propose generic dynamics describing discrete-time core-periphery models that comply with the established...

We introduce a two-period economy with asymmetric information about the state of nature that occurs in the second period. Each agent is endowed with an information structure that describes her (incomplete) ability to prove whether or not a state has occurred. We show that if the number of states...

In the presence of events that are seen as ambiguous by all agents in an economy, if preferences are representable by expected uncertain utility functions (Gul and Pesendorfer, 2014), general equilibrium does not typically exist.

Private state-verification is introduced in a two-period economy with spot markets in both periods and complete futures markets for contingent delivery in the second period. Existence of equilibrium is established, under standard assumptions. The equilibrium allocation is shown to be generically...

We study general equilibrium with private and incomplete state verification. Trade is agreed ex ante, that is, before private information is received. It is useful to define a list of bundles as a derivative good that gives an agent the right to receive one of the bundles in the list....

Private state verification is introduced in a two-period economy with spot markets in both periods and complete futures markets for contingent delivery in the second period. Existence of equilibrium is established, under standard assumptions. An example is presented in which a complete set of...