General Statistical properties of the CMB Polarization field

The distribution of the polarization of the Cosmic Microwave Background (CMB) in the sky is determined by the hypothesis of random Gaussian distribution of the primordial density perturbations. This hypotheses is well motivated by the inflationary cosmology. Therefore, the test of consistency of the statistical properties of the CMB polarization field with the Gaussianity of primordial density fluctuations is a realistic way to study the nature of primordial inhomogeneities in the Universe. This paper contains the theoretical predictions of the general statistical properties of the CMB polarization field. All results obtained under assumption of the Gaussian nature of the signal. We pay the special attention to the following two problems. First, the classification and statistics of the singular points of the polarization field where polarization is equal to zero. Second, the topology of contours of the value of the degree of polarization. We have investigated the percolation properties for the zones of ``strong'' and ``weak'' polarization. We also have calculated Minkowski functionals for the CMB polarization field. All results are analytical.Comment: Latex, 22 pages, including 5 figure

Pandemics, capital allocation and structural change

The economic impact of pandemics is commonly studied using theoretical models that assume constant returns to scale and no factor movements. This article argues that a new economic geography model with increasing returns to scale and capital mobility better explains the effects of pandemics in modern economies. Our model predicts that pandemics shape where investments are made, leading to long-term impacts on economic development. To test this, we examine the consequences of the Great Influenza Pandemic on credit allocation and structural transformation in Spain from 1915 to 1929. Our research shows that credit growth was lower in regions with high mortality. Quantitatively, a one standard deviation increase in flu-driven mortality decreases credit (per capita) by 13.6%. We also document that this flu-driven reallocation of credit resulted in an increase in relative urban GDP in low mortality rate regions. A one standard deviation increase in flu-driven credit raises relative urban GDP by 9.5%

The Redistributive Effects of Pandemics: Evidence of the Spanish Flu

This paper examines the impact of a pandemic in a developing economy. Measured by excess deaths relative to the historical trend, the 1918 influenza in Spain was one of the most intense in Western Europe. However, aggregate output and consumption were only mildly affected. In this paper we assess the impact of the flu by exploiting within-country variation in “excess deaths” and we focus on the returns to factors of production. Our main result is that the effect of flu-related “excess deaths” on real wages is large, negative, and short-lived. The effects are heterogeneous across occupations, from null to a 15 per cent decline,concentrated in 1918. The negative effects are exacerbated in more urbanized provinces. In addition, we do not find effects of the flu on the returns to capital. Indeed, neither dividends nor real estate prices (houses and land) were negatively affected by flu-related increases in mortality. Our interpretation is that the Spanish Flu represented a negative demand shock that was mostly absorbed by workers, especially in more urbanized regions

The 1918 flu pandemic left Spain a more unequal country

The 1918 flu pandemic had a short-lived but devastating effect on Spain, write Sergi Basco (Universitat de Barcelona), Jordi Domènech (Universidad Carlos III) and Joan Roses (LSE). Unlike previous pandemics, it increased inequality, as the better-off could afford to socially distance to protect themselves

Dancing with giants: contextualizing state and family ownership effects on firm performance in the Gulf Cooperation Council

The authors gratefully acknowledge the support of the Sheikh Saoud bin Khalid bin Khalid Al-Qassimi Chair in Family Business and the Spanish Ministry of Economy, Industry and Competitiveness, Secretariat for Research, Development and Innovation; project ECO2015-69058-R. Irma Martínez García acknowledges the grant from the Ministry of Education’s Faculty Training Programme (FPU14/04758)

The feasibility of milkfish (Chanos chanos) aquaculture in Solomon Islands

Fish is crucial to food and nutrition security in Solomon Islands, and demand is expected to increase due to a growing population. However, it is projected that current capture fisheries production will not meet this growing demand. Aquaculture has the potential to mitigate the capture fishery shortfall, and the Government of Solomon Islands is prioritizing aquaculture as a solution to meet future food and income needs. Aquaculture in Solomon Islands is still in early development. Mozambique tilapia (Oreochromis mossambicus) is farmed for household consumption, but its prolific reproductive rate and resulting slow growth limit its potential as a commercial aquaculture species. More productive fish species that are not indigenous to Solomon Islands but are successfully farmed overseas could be introduced; however, such a decision needs to take into account the potential ecological or social impacts. For land-based pond aquaculture, the only indigenous species that has been farmed extensively elsewhere is milkfish (Chanos chanos). This report presents a feasibility assessment for milkfish farming in Solomon Islands. It synthesizes the current knowledge about milkfish farming and presents results of a 4-year study on the potential for milkfish aquaculture in Solomon Islands