A two-commodity intertemporal framework is used to show that, in contrast to the conventional wisdom, both permanent and temporary tariffs may worsen the trade balance of a large country. For a temporary tariff the key ...

The plan of this paper is as follows: First, we summarize and point out several problems we found with Comanor's study. Section III presents the results from a two-equation model that decomposes the technical change ...

In vivo laboratory-based studies describing jaw-muscle activity and mandibular bone strain during mastication provide the empirical basis for most evolutionary hypotheses linking primate masticatory apparatus form to diet. ...

The temporal pattern of the terminal response on periodic schedules depends on when responding begins. Pigeons pecking on fixed-interval and fixed-time schedules of food reinforcement responded, or accelerated, faster the ...

Reinforcement omission in situations that show positive goal-gradients elevates subsequent responding (positive “frustration” effect). In this experiment, in a situation showing a negative goal-gradient, reinforcement ...

Classical methodology based on the application of filters for sampling, followed by extraction and analysis, introduces severe artifacts for semi-volatile compounds like ammonium nitrate. These filter methods do not meet ...