Defining personalized concepts for XBRL using iPAD‐drawn fuzzy sets

An efficient and effective analysis of business data requires a better understanding of what the data represents, and to what degree. A human‐like way of accomplishing that without being too detailed yet learning more about data content is to summarize and map the data into concepts familiar to a person performing analysis. Processes of summarization help identify the most essential facts that are embedded in the data. All this is of significant importance for analysis of large amounts of business data required to make good and sound financial decisions. There are two aspects enabling more comprehensive yet easier processing of data: a standardized representation format of financial data; and a human‐friendly way of defining concepts and using them for building personalized models representing processing data. The first of the aspects has been addressed by the eXtensible Business Reporting Language (XBRL)—a standardized format of defining, representing and exchanging corporate and financial information. The second aspect is related to providing individuals with the ability to gain understanding of data content via determining a degree of truth of statements summarizing data based on their own perception of concepts they are looking for. In this paper, we introduce a tablet application—Tablet‐based input of Fuzzy Sets (TiFS)—and demonstrate its usefulness for entering personalized definitions of concepts and terms that enable a quick analysis of financial data. Such analysis means utilization of soft queries and operations of aggregation that extract and summarize the data and present it in a form familiar to analysts. The application allows for defining concepts and terms with ‘finger‐made’ drawings representing a person's perception of concepts. Further, these definitions are used to build summarization statements for exploring XBRL data. They are equipped with ‘drawn’ definitions of linguistic terms (e.g. LARGE, SMALL, FAST) and linguistic quantifiers (e.g. ALL, MOSTLY), and enable summarization of data content from the perspective of a user's interests. The ‘drawn’ linguistic terms and quantifiers represent membership functions of fuzzy sets. Utilization of fuzzy sets allows for performing operations of data summarization in a human‐like way. The application of TiFS illustrates ease of inputting personalized definitions of concepts and their influence on the interpretation of data. This introduces aspects of personalization and adaptation of artificial intelligence systems to perceptions and views of individuals. The proposed application is used to perform a basic analysis of an XBRL document.     

Fairness and microcredit interest rates: from Rawlsian principles of justice to the distribution of the bargaining range

This paper addresses the fairness of microcredit interest rates. Since microfinance institutions provide credit for the poor at relatively high prices, the fairness of their interest rates has been repeatedly debated. We first apply Rawls' principles of justice to the case of microcredit interest rates and suggest some limitations related to the hypothesis of rationality of the borrowers and the level of inequality. We then suggest another framework based on the analysis of the distribution of the benefits generated by the transaction to assess the fairness of interest rates. We conceptualize this as the distribution of the bargaining range between the borrowers' and the institutions' reservation price and discuss what these reservation prices could be in the context of microfinance.     

No-arbitrage, state prices and trade in thin financial markets

We examine how non-competitiveness in financial markets affects the choice of asset portfolios and the determination of equilibrium prices. In our model, potential arbitrage is conducted by a few highly specialized institutional investors who recognize and estimate the impact of their trades on financial prices. We apply a model of economic equilibrium, based on Weretka (, 2007a), in which price effects are determined endogenously as part of the equilibrium concept. For the case in which markets allow for perfect insurance, we argue that the principle of no-arbitrage asset pricing is consistent with non-competitive behavior of the arbitragers and extend the fundamental theorem of asset pricing to the non-competitive setting.     

A Note on Initial Conditions and Liberalization during Transition

Literature explaining variations in economic performance among transition economies places a high level of importance on the role of policy. Policy differences are measured via a liberalization index used to explain differences in performance. We find that this index may be endogenous to one performance measure, e.g., output decline, and may, therefore, overstate the role of policy. This paper performs an instrumental variables (IV) estimate of the relationship between liberalization and performance that also allows us to generate a relative index of reform progress. The relative index challenges some commonly held preconceptions about which transition economies are rapid reformers and which are slow reformers.J. Comp. Econom.,December 1998, 26(4), pp. 718–734. Macalester College, 1600 Grand Avenue, St. Paul, Minnesota 55105.     

Czech privatisation 25 years later

Privatisation is still a hot political topic today and divides economists as well as politicians and the general public. The paper aims to capture the Czech privatisation in its historical, economic and political contexts. The first part explains the difference between transitional privatisation and standard privatisation. The second part examines the interests in the privatisation process. The third part discusses the privatisation methods used in the Czech Republic. The fourth part offers an international comparison.     

Can mutual funds time risk factors?

Using daily observations from 448 actively managed funds, we employ the methodology in Bollen and Busse (2001) in order to assess the ability of fund managers to time systematic risk factors. We first construct synthetic portfolios in order to obtain the empirical distribution of timing coefficients under the null hypothesis of no timing ability and then compare this distribution to that of the timing coefficients of the actual funds. Fund managers do not seem to be timing any of the risk factors. We interpret this result as evidence that factor timing ability does not persist over long time periods.     

Whence reform? A critique of the stiglitz perspective

This paper discusses the key hypotheses which Joseph Stiglitz proposed, in his wide-ranging critique of the “Washington Consensus”, with regard to transition reforms and economic policies in China and Russia. The primary purpose is to evaluate the Stiglitz perspective in the light of empirical evidence, including the experience of countries outside China and Russia. Although some of the points Stiglitz makes are important for understanding what has happened in the transition, this paper argues that his perspective mis-interprets the key facts of the Chinese transition, mis-describes the facts of the Russian transition and fails to consider the theoretical and policy implications of the success of a “third model”, which is represented by some Central European and Baltic transitions.     

Regional determinants of MNE’s location choice in post-transition economies

This article focuses on the impact of agglomeration and labour market factors on the location choice of MNEs in post-transition economies. We compare data from 33 regions in East Germany, the Czech Republic and Poland using a mixed logit model on a sample of 4,343 subsidiaries for the time period between 2000 and 2010. The results show that agglomeration advantages, such as sectoral specialization as well as a region’s economic and technological performance prove to be some of the most important pull factors for FDI in post-transition regions. With respect to access to labour, the results suggest that FDI in post-transition regions is (no longer) only dominated by efficiency seeking behaviour, but also by access to well-qualified labour.     

An Extension of Arrow's Result on Optimal Reinsurance Contract

We consider the problem of finding reinsurance policies that maximize the expected utility, the stability and the survival probability of the cedent for a fixed reinsurance premium calculated according to the maximal possible claims principle. We show that the limited stop loss and the truncated stop loss are the optimal contracts.     

Rothbardian demand: A critique

This paper refutes Rothbard??s claim that the law of diminishing marginal utility implies a non-increasing demand curve. It is argued that the law under Rothbard??s interpretation is, in fact, irrelevant for demand theory. An example of increasing demand is provided.