Platforms refer to intermediaries that facilitate economic interaction between two sets of agents wherein the decisions of one set of agents are likely to have an effect on the other via direct and/or indirect externalities. Given their nature, platforms need to find the appropriate balance between the competing objectives of agents and act as catalysts by facilitating the beneficial effects of externalities. In this paper, we discuss the current theoretical and empirical literature on two-sided platforms. We then identify three dimensions that offer opportunities to advance the empirical literature: (a) unanswered theoretical and conceptual questions, (b) data-related opportunities, and (c) methodological challenges.
In this article, I estimate demand for the personal computer central processing unit and measure consumer welfare using the pure characteristics demand model. The model is based on a quasilinear utility function with multiplicative random variables and does not have the idiosyncratic logit error term, so that consumer welfare directly reflects consumers' valuation of product characteristics. Welfare calculations show that consumer surplus comprises approximately 90% of total social surplus and that large welfare gains have resulted from the introduction of new products.
BackgroundThis study aimed to develop a biocontrol system for ginseng root rot caused by Fusarium cf. incarnatum.MethodsIn total, 392 bacteria isolated from ginseng roots and various soils were screened for their antifungal activity against the fungal pathogen, and a bacterial isolate (B2-5) was selected as a promising candidate for the biocontrol because of the strong antagonistic activity of the bacterial cell suspension and culture filtrate against pathogen.ResultsThe bacterial isolate B2-5 displayed an enhanced inhibitory activity against the pathogen mycelial growth with a temperature increase to 25°C, produced no pectinase (related to root rotting) and no critical rot symptoms at low [106 colony-forming units (CFU)/mL] and high (108 CFU/mL) inoculum concentrations. In pot experiments, pretreatment with the bacterial isolate in the presumed optimal time for disease control reduced disease severity significantly with a higher control efficacy at an inoculum concentration of 106 CFU/mL than at 108 CFU/mL. The establishment and colonization ability of the bacterial isolates on the ginseng rhizosphere appeared to be higher when both the bacterial isolate and the pathogen were coinoculated than when the bacterial isolate was inoculated alone, suggesting its target-oriented biocontrol activity against the pathogen. Scanning electron microscopy showed that the pathogen hyphae were twisted and shriveled by the bacterial treatment, which may be a symptom of direct damage by antifungal substances.ConclusionAll of these results suggest that the bacterial isolate has good potential as a microbial agent for the biocontrol of the ginseng root rot caused by F. cf. incarnatum.
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