Nonprofit sector integrates an important part of the economy, which serves as a critical factor for social change. Social innovation and social entrepreneurship are of paramount importance for the nonprofit sector aiming to solve social needs. The purpose of this paper is, through bibliometric mapping techniques, based on 2695 documents, to understand thematic evolution of social innovation and social entrepreneurship. The main conclusion is that, from the analysis, we can see that the scientific production in this field of knowledge has intensified in recent years, but the centrality and the search density undergo major changes. New paths for future research are outlined.

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For stationary sequences, under general local and asymptotic dependence restrictions, any limiting point process for time normalized upcrossings of high levels is a compound Poisson process, i.e., there is a clustering of high upcrossings, where the underlying Poisson points represent cluster positions, and the multiplicities correspond to cluster sizes. For such classes of stationary sequences there exists the upcrossings index η, 0 ≤ η ≤ 1, which is directly related to the extremal index θ, 0 ≤ θ ≤ 1, for suitable high levels. In this paper we consider the problem of estimating the upcrossings index η for a class of stationary sequences satisfying a mild oscillation restriction. For the proposed estimator, properties such as consistency and asymptotic normality are studied. Finally, the performance of the estimator is assessed through simulation studies for autoregressive processes and case studies in the fields of environment and finance.

PurposeThe COVID-19 pandemic caused unprecedented global turmoil and a halt on international tourism. This study aims to evaluate the scientific literature about tourism crisis and disasters and depicts how this research stream evolved in the face of economic, security, health, environmental or trust crises, further providing insights about a research agenda on this stream.Design/methodology/approachThis study uses bibliometric methods and topic models, specifically latent Dirichlet allocation (LDA) methods to evaluate the nature and course of the tourism crises and disasters scientific literature. Data from 2,810 documents were retrieved from the Web of Science database and were used to perform the analysis.FindingsThe results show an increase of tourism crises and disasters scientific literature departing from 2010, and a surge in 2020 and 2021 due to the COVID-19 pandemic. Furthermore, themes such as tourism competitiveness, tourism demand, crisis management, perceived risk, natural disasters and destination recovery are among the most relevant themes in the research line, showing that the effect of economic and financial crises on tourism industry, sustainable tourism and tourism demand are set to be among the most relevant in the upcoming years.Research limitations/implicationsThis study fills a void in the tourism literature by providing a roadmap to understand the past, present and future of the tourism crises and disasters research line and the avenues for future research in this field, including methods, in the period post-COVID-19.Originality/valuePrevious studies on tourism crises and disasters were focused on literature review and on the relationship between crises and disasters and the tourism industry. This study uses a set of methods unused before in the research stream, namely, a combination of bibliometric methods and LDA methods, to provide a road map for the present state-of-the-art of tourism crises and disasters research and promising future research lines.

This study aims to fulfil a gap in the literature, delivering a road map to understand the course and nature of the fair value accounting literature, further showing how the 2008–2009 financial crisis affected it. Bibliometric methods analyze 377 documents retrieved from the Web of Science and Scopus databases. Results show a heavy increase in fair value accounting literature starting due to the 2008–2009 financial crisis, further showing a shift from fair value accounting regulations to topics such as fair value measurement, earnings management, value relevance, and banks. Results provide further evidence about relevant themes, showing that topics related to financial crises stay relevant, even during times of growth.