知情交易度量的 Lévy 跳方法及实证研究

金融市场中存在着由私有信息推动的知情交易,其具有行为复杂、甄别困难等特性。本文以股票价格序列的 Lévy 跳为工具揭示交易价格的异常波动,从而测度这一较为特殊的交易情况。基于 Lévy 跳跃程度的度量方法和知情交易概率 PIN 模型,文章研究了股票价格的跳跃异常程度与股票交易的 PIN 值之间的相关性情况,发现两者之间具有显著的相关关系,并通过事件研究进一步支持了跳跃程度可以在一定程度上度量知情交易的假设。于此同时,给出了跳跃程度异常系数的计算方法,用以在实践中度量跳跃的异常程度,为知情交易的监管等提供了另一种工具上的选择。     

Improving the protection of migrant workers with work histories in the European Union and Ibero-America: Enhancing the coordination of international social security instruments

Migration affects almost every nation, emphasizing the need to guarantee social security rights for all migrants and their families. This article focuses on the rights of workers who migrate between the countries of the European Union (EU) and the Ibero-American community. In the EU, social security systems are increasingly coordinated through Regulation No. 883/2004 and its Implementing Regulation No. 987/2009. In the Ibero-American community, coordination is sought through the Ibero-American Social Security Convention. Despite convergence between these two international instruments, coordination is still lacking between them. This article presents a comparative analysis to articulate the necessary mechanisms to guarantee coordination, to respect the social security rights of migrant workers. We focus on the cooperation and coordination between regional as well as national systems, specifically looking at the need for and aims of a rapprochement between these two major international coordination instruments to provide greater EU-Ibero-American cooperation. Finally, the importance of promoting greater international cooperation in social security policy and administration is highlighted, to engender the adequate protection of the rights as well as the free movement of migrant workers.     

Les plateformes de travail numérique et l‘évolution de la main-d‘œuvre en ligne en Fédération de Russie: une analyse sur dix ans

Les auteurs décrivent l'évolution du marché du travail indépendant en ligne en Fédération de Russie et dans l'espace postsoviétique. Les données proviennent d'une enquête originale, adressée à quatre reprises, entre 2009 et 2019, aux utilisateurs d'une grande plateforme d'intermédiation en langue russe, axée sur les métiers créatifs et l'économie du savoir. Plusieurs tendances se dégagent: expansion de l'aire de recrutement; diversification des spécialisations; féminisation, vieillissement et qualification de la main-d'œuvre; péjoration de l'adéquation profil-tâches; consolidation des parcours indépendants en ligne, plateformisation et formalisation. Les auteurs commentent ces évolutions et formulent des recommandations d'action en vue du développement futur du secteur en Fédération de Russie.     

Digital social security accounts for platform workers: The case of Estonia’s entrepreneur account

Advancements in technology enable new opportunities for creating digital social security accounts, but the effectiveness of these to solve the accessibility and eligibility issues facing platform workers has not been assessed fully in the literature. The potential of digital social security accounts lies in their ability to consider the possible different streams of income of atypical workers and to improve the effective access of these workers to social security. Tax and social security offices can now exchange information on the income of platform workers in real time, which offers the promise of formalizing the previously informal casual work relationships of the self-employed. This article explores the case of the Estonian entrepreneur account as a digital hybrid solution for improving the effective access to social security of platform workers. Digital portable accounts create the conditions for the structural improvement required to respond adequately to meet the changing social security needs of atypical workers. However, this also requires that the policy design be thought through carefully, to avoid digital portable accounts being simply a digital facilitator of outdated solutions.