Processes for stocks capturing their statistical properties from one day to one year

A realistic ARCH process is set up so as to duplicate, for all practical purposes, the properties of stock time series from 1 day to 1 year. The process includes heteroskedasticity with long memory, leverage, fat-tail innovations, relative return, price granularity, and holidays. Its adequacy to describe empirical data is controlled over a broad panel of statistics, including (robust L-statistics) skew, (robust) kurtosis, shape factor for the volatility distribution, and lagged correlations between combinations of return and volatility. These statistics are computed for returns and volatilities with characteristic time intervals ranging from 1 day to 1 year. This wide cross-check between stock time series and simulations ensures that the most important features of the data are correctly captured by the process up to 1 year. The by-products of the statistical analyses and estimations are (1) a positive skew, (2) a cross-sectional relation between kurtosis and heteroskedasticity, (3) a very similar cross-sectional distribution for the statistics evaluated over the empirical data set or for the process with one set of parameters and (4) the heteroskedasticity is very close to an integrated volatility process.     

Regime-Dependent Fiscal Multipliers in the United States

This paper proposes a regime-dependent model to estimate fiscal multipliers in the US. Output, consumption and investment are assumed to respond to tax and spending changes in a nonlinear manner. Fiscal multipliers are time-varying because their size and sign depend upon the state of the economy (upturns and downturns). Keynesian effects appear essentially during downturns, while anti-Keynesian effects are observed during expansions. Transfer payments contributes to a higher private consumption when they are given to consumers in bad times. Reducing taxes boosts consumption in good times. Investment responds positively to lower taxes during downturns, but negatively in the upturn regime. Our results thus suggest that Keynesian effects have been associated to expansionary policies during recessions, while anti-Keynesian effects were observed during expansions illustrating situations of expansionary fiscal consolidation. The effectiveness of fiscal positive impulses increases in downturns relative to upturns. A corollary is therefore that austerity measures during recessions would have detrimental effects on the GDP and its components.     

Viewpoint: From cities to productivity and growth in developing countries

Abstract.  This paper reviews the evidence about the effects of urbanization and cities on productivity and economic growth in developing countries using a consistent theoretical framework. As in developed economies, there is strong evidence that cities in developing countries bolster productive efficiency. Regarding whether cities promote self-sustained growth, the evidence is suggestive but ultimately inconclusive. These findings imply that the traditional agenda of aiming to raise within-city efficiency should be continued. Furthermore, reducing the obstacles to the reallocation of factors across cities is also desirable.     

Innovation as an internationalisation determinant of Brazilian technology-based SMEs

The general objective of this article is to analyse innovation as a determinant of the internationalisation patterns of Brazilian technology-based SMEs (small and medium enterprises) in different sectors and with different technological features. The theoretical background of this article centres on the typologies of innovation, SMEs’ internationalisation patterns, and innovation as an internationalisation determinant. The main theoretical contributions of this qualitative study are its analysis of innovation of the firm, focusing on the type of innovation, the degree of novelty, and the degree of control over the innovation process as determinants of their internationalisation patterns, and the influence of the external organisational environment on innovation and internationalisation. In terms of managerial implications, we highlight the effect of these factors on the competitiveness of case firms in international markets. Finally, our suggestions for future studies include the need for research replication in other emerging markets, the inclusion of both mature and young technology-based SMEs in the sample, the use of longitudinal data for case studies, and the validation of this qualitative study through a quantitative study that includes a larger sample of technology-based SMEs.