This note considers the Leduc and Liu (JME, 2016) model and studies the e¤ects of their uncertainty shock under di¤erent Taylor-types rules. It shows that both the responses of real and nominal variables highly depend on the Taylor rule considered. Remarkably, in ‡ation reacts positively so that uncertainty shocks look more like supply shocks, once an empirically plausible degree of interest rate smoothness is taken into account. This result is reinforced with less reactive monetary rules. Overall, these rules bring about a less severe recession.

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The relationships between cannibalism and pattern formation in spatially extended preypredator systems are studied with a model that degenerates, in the absence of cannibalism, into the most standard prey-predator model, known as Rosenzweig-MacArthur model. The analysis is based on the theory developed long ago by Turing in his famous paper on morphogenesis, but in a special form which allows one to decouple the role of demographic parameters from that of diffusive dispersal. The proofs are given in terms of prey and predator nullclines because ecologists are mainly familiar with this technique. The final result of the analysis is that spatial pattern can exist only in systems with highly cannibalistic and highly dispersing predator provided the attractor of the system in the absence of cannibalism is a limit cycle. This result is more simple and more complete than that published in this journal a few years ago by Sun and coauthors.

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