We show that trade credit contracts between sectors can provide a useful alternative to fiscal transfers during a major productivity shock. Defaults in credit contracts function as transfers between sectors, which can be implemented through a bankruptcy law or through credit renegotiation. Transfers implemented through defaults allow for a reduction in the size of the fiscal policy that restores the economy to the optimal allocation, constituting a relevant alternative to economies without an available fiscal space to implement the optimal policy.

Among nectarivorous birds, the highest niche partitioning occurs between hummingbirds and plants. Although hummingbirds tend to visit morphologically well-matched resources, as ornithophilous species, they can also visit flowers with other traits. Here, we investigated whether the niche partitioning in hummingbird-plant interactions is also observed with ornithophilous species only. We also explored if hummingbird traits predicted resources use. We recorded a plant-ornithophilous species network in a semi-deciduous forest in Brazil. We quantified interaction partitioning through network connectance, complementary specialisation, and modularity. The influence of hummingbirds’ traits into their visits was investigated through methods of functional ecology and ecological networks. We recorded 948 interactions between nine hummingbirds and seven ornithophilous plants. We detected similar patterns of niche partitioning between hummingbirds and ornithophilous plants in comparison to networks considering the entire plant community. However, hummingbird species with the most specialised interactions are different from those when the whole system is evaluated. Therefore, we cannot downscale the patterns from one scale to the other. The pattern of interaction with ornithophilous plants was not related to hummingbirds’ traits. Therefore, the coexistence of species with shared traits might be occurring through facilitative and competitive processes, leading to trait mismatching and maintaining niche partitioning among ornithophilous plants.

We hypothesize that informal bank networks influence corporate credit access in China. Our sample comprises a panel of 515 corporations listed on China's stock exchanges with a total of 1,052 firm-year observations, holding a total of 7,009 major bank loans from 183 distinct banks between 2007 and 2012. Results support the hypothesis that closure in bank networks facilitates credit access. We further show that the positive closure-performance association offers fewer advantages if financial markets and the legal infrastructure are relatively well developed. Our findings contribute to an emergent literature examining how informal networks can productively substitute weak formal institutions, and how the interplay between informal networks and network embeddedness shapes individual and corporate strategies.

Statistical inference on graphs often proceeds via spectral methods involving low-dimensional embeddings of matrix-valued graph representations such as the graph Laplacian or adjacency matrix. In this paper, we analyze the asymptotic information-theoretic relative performance of Laplacian spectral embedding and adjacency spectral embedding for block assignment recovery in stochastic blockmodel graphs by way of Chernoff information. We investigate the relationship between spectral embedding performance and underlying network structure (e.g., homogeneity, affinity, core-periphery, and (un)balancedness) via a comprehensive treatment of the two-block stochastic blockmodel and the class of K-blockmodels exhibiting homogeneous balanced affinity structure. Our findings support the claim that, for a particular notion of sparsity, loosely speaking, “Laplacian spectral embedding favors relatively sparse graphs, whereas adjacency spectral embedding favors not-too-sparse graphs.” We also provide evidence in support of the claim that “adjacency spectral embedding favors core-periphery network structure.”

This research responds to calls for studies aimed at developing a more nuanced understanding of women small business owners’ networking behaviours and structures. The study examined whether business start-up motivations and phase of the business (prestart-up, start-up and established) influenced women’s networking behaviours and structures. Semistructured interviews were conducted with 28 women. Interview data were used to categorise participants into classic, forced, and work–family owners. Analysis of the interviews found no marked differences in networking behaviours and network structures of participants during prestart-up phase. During start-up and established phases differences began to emerge. Given that classic and forced owners had established their businesses for financial reasons, a diverse network was more relevant for them. However, work–family participants established the business for family/work balance, thus a small network of close ties was sufficient to achieve their business goals. Theoretical, practical and research implications of the findings are outlined.

This paper explores the concept of knowledge networks in order to disclose how firms are able to increase innovative performance as a result of network structure and network content, which concern how firms connect with network partners (network structure), what the essence of exchange is for firms to acquire knowledge in the network (knowledge heterogeneity), and why firms need to cooperate with others (knowledge cognition). By using a sample of 144 high-technology firms in Taiwan’s science parks to test the hypotheses, the results of this study show that, while network structures do impact on a firm’s innovative performance, access to heterogeneous knowledge and increasing a firm’s knowledge in terms of defining and recognizing novel knowledge should be considered, since both play critical roles in facilitating innovative performance. These findings suggest that knowledge flow through a firm’s relationships must be understood in terms of network structure and content.

The purpose of this study is to gain insight into the relations between gender, networking behavior and network structure, in order to investigate the relevance of gender for organizational networks. Semi-structured interviews with 39 white, Dutch, women and men account managers were analyzed both qualitatively and quantitatively. Our study's results show that the men account managers employ exchange and affect-based trust networking and, to a lesser extent, authoritative networking, whereas the women account managers employ affect-based trust and also use exchange. Authoritative networking appears to foster higher status ties, exchange networking behavior fosters lower status ties and affect-based trust networking fosters equal status ties. Gender differences in network structure may be explained by networking behavior rather than by gender. Our study is limited by the size of our group of respondents (n = 39). A larger sample is needed to test hypotheses concerning the relations between networking behavior, network structure and gender in a more rigorous manner than our study allowed. However, our research material enabled us to test these relations in a sound, be it preliminary way. Our study suggests to focus less on gender as a demographic bivariate category to explain gender differences in network structures and outcomes. In so doing, organizational network research will gain more insight into how gender expectations are negotiated in networking. In organizational practice, this will support organization members to employ the diversity of networking behaviors necessary to generate optimal network structures and outcomes. While most organizational network research focuses on network structures, we introduce the relational process of fostering network relations as central to women's and men's networking behavior. Networking behavior may have greater explanatory power for differences in network structure, than gender as a demographic, bivariate variable.

Philornis is a neotropical, monophyletic genus of Muscidae (Diptera) (Couri et al. 2007) that includes many bird parasites (Skidmore 1985). The interaction system of Philornis and birds is very peculiar: fly adults are free-living and only larvae interact with birds (Couri 1985, 1999; Dodge 1963). Larval trophic habits are known for 22 of the 49 species (de Carvalho et al. 2005) and are divided into three groups: coprophagous (P. aitkeni and P. rufoscutellaris), free-living haematophagous (P. falsificus) and subcutaneous (18 spp.). Philornis downsi is unusual because the first and the early second instars display a subcutaneous phase, whereas the late second and third phases show a nest-dwelling haematophagous phase (Fessl et al. 2006).

Topologically modeled amorphized silica structures have been refined using a molecular dynamics simulation technique. Several metastable structures with substantially different medium-range connectivities, as characterized by primitive ring statistics, were obtained. Whereas the total correlation function is insensitive to these differences, the first sharp diffraction peak derived from energy-filtered electron diffraction shows a promising correlation to medium-range structure.