Folksonomy: the New Way to Serendipity

Folksonomy expands the collaborative process by allowing contributors to index content. It rests on three powerful properties: the absence of a prior taxonomy, multi-indexation and the absence of thesaurus. It concerns a more exploratory search than an entry in a search engine. Its original relationship-based structure (the three-way relationship between users, content and tags) means that folksonomy allows various modalities of curious explorations: a cultural exploration and a social exploration. The paper has two goals. Firstly, it tries to draw a general picture of the various folksonomy websites. Secundly, since labelling lacks any standardisation, folksonomies are often under threat of invasion by noise. This paper consequently tries to explore the different possible ways of regulating the self-generated indexation process.taxonomy; indexation; innovation and user-created content

On Financial Markets Incompleteness, Price Stickiness, and Welfare in a Monetary Union

In this paper, we measure the welfare costs/gains associated with financial market incompleteness in a monetary union. To do this, we build on a two-country model of a monetary union with sticky prices subject to asymmetric productivity shocks. For most plausible values of price stickiness, we show that asymmetric shocks under incomplete financial markets give rise to a lower volatility of national inflation rates, which proves welfare improving with respect to the situation of complete financial markets. The corresponding welfare gains are equivalent to an average increase of 1.8% of permanent consumption.Monetary union, Asymmetric shocks, Price stickiness, Financial market incompleteness, welfare

Bargaining Frictions, Labor Income Taxation and Economic Performance

A matching model with labor/leisure choice and bargaining frictions is used to explain (i) differences in GDP per hour and GDP per capita, (ii) differences in employment, (iii) differences in the proportion of part{time work across countries. The model predicts that the higher the level of rigidity in wages and hours the lower are GDP per capita, employment, part-time work and hours worked, but the higher is GDP per hour worked. In addition, it predicts that a country with a high level of rigidity in wages and hours and a high level of income taxation has higher GDP per hour and lower GDP per capita than a country with less rigidity and a lower level of taxation. This is due mostly to a lower level of employment. In contrast, a country with low levels of rigidity in hours and in wage setting but with a higher level of income taxation has a lower GDP per capita and a higher GDP per hour than the economy with low rigidity and low taxation. In this configuration,the level of employment is similar in both economies but the share of part-time work is larger.models of search and matching, bargaining frictions, economic performance, labor market institutions, part-time jobs, labor market rigidities

Consumption Growth and the Real Interest Rate following a Monetary Policy Shock : Is the Habit Persistence Assumption Relevant?

In this paper, we study the role of habit formation in accounting for the joint behavior of the real interest rate and consumption growth following a contractionary monetary policy shock, the real interest rate exhibits a persistent increase while consumption growth drops persitently. As the standard permanent income model is known to be unable to replicate this co-movement for intertemporal substitution motives, we introduce habit persistence in consumption behavior. We test the implied Euler equation using a method of moments on conditional moments (IRF) obtained from the VAR Model. Our estimates of the habit persistence parameter are similar to previous results in the literature. Further, we find empirical support in favor of habit formation as a relevant assumption to represent the joint behavior of the real interest rate and the consumption growth following a monetary policy shock. Finally, we show that habit formation allows weakening the intertemporal substitution mechanismhabit persistence, consumption growth, real interest rate, vector autoregressive, monetary policy shock

On financial markets inclompleteness, price stickyness and welfare in a monetary union ?

In this paper, we measure the welfare costs/gains associated with financial market incompleteness in a monetary union. To do this, we build on a two-country model of a monetary union with sticky prices subject to asymmetric productivity shocks. For most plausible values of price stickiness, we show that asymmetric shocks under incomplete financial markets give rise to a lower volatility of national infation rates, which proves welfare improving with respect to the situation of complete financial markets. The corresponding welfare gains are equivalent to an average increase of 1.8% of permanent consumption.monetary union, asymmetric shocks, price stickiness, financial market incompleteness, welfare

Investment, Matching and Persistence in a modified Cash-in-Advance Economy

We simulate and estimate a new Keynesian search and matching model with sticky wages in which capital has to be financed with cash, at least partially. Our objective is to assess the ability of this framework to account for the persistence of output and inflation observed in the data. We find that our setup generates enough output and inflation persistence with standard stickiness parameters. The key factor driving these results is the inclusion of investment in the CIA constraint, rather than any other nominal or real rigidity. The model reproduces labor market dynamics after a positive increase in productivity: hours fall, nominal wages hardly react, and real wages go up. Regarding money supply shocks, we investigate the conditions under which our model specification generates the liquidity effect, a fact which is absent in most sticky price models.persistence; sticky prices; staggered bargaining wages; monetary facts; labor market facts; cash-in-advance.

On Stickiness, Cash in Advance, and Persistence

This paper shows that a model which combines sticky price and sticky wages with investment in the cash-in-advance constraint generates business cycle dynamics consistent with empirical evidence. The model reproduces the responses of the key macroeconomic variables to technology and money supply shocks. In particular, the model generates enough output and inflation persistence with standard stickiness parameters. This setup is also able to generate the liquidity effect after a money injection, overcoming other standard new Keynesian models.sticky prices; sticky wages; monetary facts; labor market facts; cash-in-advance