Middleware’s message : the financial technics of codata

In this paper, I will argue for the relevance of certain distinctive features of messaging systems, namely those in which data (a) can be sent and received asynchronously, (b) can be sent to multiple simultaneous recipients and (c) is received as a “potentially infinite” flow of unpredictable events. I will describe the social technology of the stock ticker, a telegraphic device introduced at the New York Stock Exchange in the 1860s, with reference to early twentieth century philosophers of synchronous experience (Bergson), simultaneous sign interpretations (Mead and Peirce), and flows of discrete events (Bachelard). Then, I will show how the ticker’s data flows developed into the 1990s-era technologies of message queues and message brokers, which distinguished themselves through their asynchronous implementation of ticker-like message feeds sent between otherwise incompatible computers and terminals. These latter systems’ characteristic “publish/subscribe” communication pattern was one in which conceptually centralized (if logically distributed) flows of messages would be “published,” and for which “subscribers” would be spontaneously notified when events of interest occurred. This paradigm—common to the so-called “message-oriented middleware” systems of the late 1990s—would re-emerge in different asynchronous distributed system contexts over the following decades, from “push media” to Twitter to the Internet of Things

Evolution of worldwide stock markets, correlation structure and correlation based graphs

We investigate the daily correlation present among market indices of stock exchanges located all over the world in the time period Jan 1996 - Jul 2009. We discover that the correlation among market indices presents both a fast and a slow dynamics. The slow dynamics reflects the development and consolidation of globalization. The fast dynamics is associated with critical events that originate in a specific country or region of the world and rapidly affect the global system. We provide evidence that the short term timescale of correlation among market indices is less than 3 trading months (about 60 trading days). The average values of the non diagonal elements of the correlation matrix, correlation based graphs and the spectral properties of the largest eigenvalues and eigenvectors of the correlation matrix are carrying information about the fast and slow dynamics of correlation of market indices. We introduce a measure of mutual information based on link co-occurrence in networks, in order to detect the fast dynamics of successive changes of correlation based graphs in a quantitative way.Comment: 8 pages, 11 figure

The effects of globalisation of financial services on banking industry and stock market: an Algerian case study

Since the mid-1980s, Algeria has embarked on a programme of comprehensive financial liberalisation to establish a market-oriented financial system, and to develop the role of the Algiers Stock Exchange in the mobilisation of financial resources. The transition from a centrally planned to a market-oriented economy meant fewer regulatory barriers towards local and foreign banks. This study demonstrates that financial liberalisation is the main force that drives the globalisation of financial services, followed by financial innovations and the Internet. Globalisation has affected the performance of the two prevalent banking models in Algeria: interest based (conventional) and non- interest-based (Islamic). The benchmarks used to assess banking performance are: competition, profitability and efficiency. Quantitative and qualitative analyses show a direct link between banking efficiency and the globalisation of financial services. The study concludes that globalisation has more advantages than disadvantages to the Algerian banking sector and the Algiers Stock Exchange. The elimination of regulatory barriers has enabled state-owned banks to improve the quality of their services and to use more advanced information technologies. Private and foreign banks are also involved in the modernisation of the Algerian banking industry by launching innovative financial products and attracting local and foreign capital. However, this project emphasises that the removal of remaining regulatory obstacles would enable banks to benefit fully from the process of financial liberalisation, and to be active institutions in the financial market. Moreover, opening the Algiers Stock Exchange to large domestic and foreign companies would attract capital investments and boost equity trading in Algeria