In this paper, the authors study the effectiveness of the Japanese monetary policy set by the Bank of Japan (BOJ) to contrast the three major crises that the country has experienced since the second half of the 90s: t...In this paper, the authors study the effectiveness of the Japanese monetary policy set by the Bank of Japan (BOJ) to contrast the three major crises that the country has experienced since the second half of the 90s: that of the lost decade, that of 2008 and that of the Covid-19 pandemic. To this end, they use a particular type of mathematical-statistical model that is widely applied today in the economic field, namely a simultaneous equation model (SEM). This simultaneous equation model is estimated through an Iteratively reweighted least squares (IRLS) using quarterly historical series in the sample period Q1 1994 - Q2 2020. All data are in real terms. The results, appropriately compared with those of other authors, suggest that the monetary policy has a (limited) impact only on the interbank market. The fiscal policy, instead, has a greater ability to influence the money supply, the private consumption and the inflation expectations.展开更多
In this paper, some theoretical notions of well-posedness and of well-posedness in the generalized sense for scalar optimization problems are presented and some important results are analysed. Similar notions of well-...In this paper, some theoretical notions of well-posedness and of well-posedness in the generalized sense for scalar optimization problems are presented and some important results are analysed. Similar notions of well-posedness, respectively for a vector optimization problem and for a variational inequality of differential type, are discussed subsequently and, among the various vector well-posedness notions known in the literature, the attention is focused on the concept of pointwise well-posedness. Moreover, after a review of well-posedness properties, the study is further extended to a scalarizing procedure that preserves well-posedness of the notions listed, namely to a result, obtained with a special scalarizing function, which links the notion of pontwise well-posedness to the well-posedness of a suitable scalar variational inequality of differential type.展开更多
The present contribution arises with the intent of providing a brief, and therefore not exhaustive, theoretical accommodation of the problematics related to the programming and the achievement of an event. In reality,...The present contribution arises with the intent of providing a brief, and therefore not exhaustive, theoretical accommodation of the problematics related to the programming and the achievement of an event. In reality, the aim of the paper is to develop optimal advertising policies for an event that takes place at a given future instant of time (a sport game, a concert, a ballet or a theatre performance) and to minimize the advertising costs concerning the organization of the event. More precisely, the paper faces the problem of how to diffuse over time the informations about a forthcoming event among a population of potential participants and it takes into consideration, among the main vehicles for the dissemination of information, the word-of-mouth effect, a kind of advertising which is independent of the firm advertising policy.展开更多
文摘In this paper, the authors study the effectiveness of the Japanese monetary policy set by the Bank of Japan (BOJ) to contrast the three major crises that the country has experienced since the second half of the 90s: that of the lost decade, that of 2008 and that of the Covid-19 pandemic. To this end, they use a particular type of mathematical-statistical model that is widely applied today in the economic field, namely a simultaneous equation model (SEM). This simultaneous equation model is estimated through an Iteratively reweighted least squares (IRLS) using quarterly historical series in the sample period Q1 1994 - Q2 2020. All data are in real terms. The results, appropriately compared with those of other authors, suggest that the monetary policy has a (limited) impact only on the interbank market. The fiscal policy, instead, has a greater ability to influence the money supply, the private consumption and the inflation expectations.
文摘In this paper, some theoretical notions of well-posedness and of well-posedness in the generalized sense for scalar optimization problems are presented and some important results are analysed. Similar notions of well-posedness, respectively for a vector optimization problem and for a variational inequality of differential type, are discussed subsequently and, among the various vector well-posedness notions known in the literature, the attention is focused on the concept of pointwise well-posedness. Moreover, after a review of well-posedness properties, the study is further extended to a scalarizing procedure that preserves well-posedness of the notions listed, namely to a result, obtained with a special scalarizing function, which links the notion of pontwise well-posedness to the well-posedness of a suitable scalar variational inequality of differential type.
文摘The present contribution arises with the intent of providing a brief, and therefore not exhaustive, theoretical accommodation of the problematics related to the programming and the achievement of an event. In reality, the aim of the paper is to develop optimal advertising policies for an event that takes place at a given future instant of time (a sport game, a concert, a ballet or a theatre performance) and to minimize the advertising costs concerning the organization of the event. More precisely, the paper faces the problem of how to diffuse over time the informations about a forthcoming event among a population of potential participants and it takes into consideration, among the main vehicles for the dissemination of information, the word-of-mouth effect, a kind of advertising which is independent of the firm advertising policy.
