Trade and Employment: Stylized Facts and Research Findings

The substantial literature investigating the links between trade, trade policy, and labour market outcomes has generated a number of stylized facts, but many open questions remain. A common finding is that much of the shorter-run impacts of trade and reforms involve reallocation of labour or wage impacts within sectors. Wage responses to trade and trade reforms are generally greater than employment impacts, but trade can only explain a small fraction of the general increase in wage inequality observed in recent decades. A priority area for future research is to study the employment effects of services trade and investment reforms.trade liberalization, labour markets, trade and wages, trade and employment

Trade and employment : stylized facts and research findings

The substantial literature investigating the links between trade, trade policy, and labor market outcomes-both returns to labor and employment-has generated a number of stylized facts, but many open questions remain. This paper surveys the subset of the literature focusing on trade policy and integration into the world economy. Although in the longer run trade opportunities can have a major impact in creating more productive and higher paying jobs, this literature tends to take employment as given. A common finding is that much of the shorter run impacts of trade and reforms involve reallocation of labor or wage impacts within sectors. This reflects a pattern of expansion of more productive firms-especially export-oriented or suppliers to exporters-and contraction and adjustment of less productive enterprises in sectors that become subject to greater import competition. Wage responses to trade and trade reforms are generally greater than employment impacts, but trade can only explain a small fraction of the general increase in wage inequality observed in both industrial and developing countries in recent decades. A feature of the literature survey is that the focus is almost exclusively on industries producing goods. Given the importance of service industries as a source of employment and determinants of competitiveness, the paper argues that one priority area for future research is to study the employment effects of services trade and investment reforms.

More favorable and differential treatment of developing countries : toward a new approach in the World Trade Organization

The authors discuss options that could be considered in the World Trade Organization (WTO) to provide more favorable treatment-so-called special and differential treatment (SDT)-to small and low-income countries. They argue that there is a need both for differentiation across WTO members and for steps that would benefit all developing countries. The authors suggest the following to make the Doha Round more supportive of development: 1) A binding commitment by industrial countries to abolish export subsidies and nontariff barriers (tariff quotas) and to reduce most-favored-nation tariffs on labor-intensive products of export interest to developing countries to no more than 5 percent in 2010, and to no more than 10 percent for agricultural products. All tariffs on manufactures should go to zero by 2015, the target date for the achievement of the Millennium Development Goals. Liberalization should also be undertaken by developing countries on the basis of a formula approach. 2) A binding commitment by industrial countries on services to expand temporary access for service providers by a specific amount-for example, equal to an additional 1 percent of the workforce-and not to restrict cross-border trade (for example, by telecom channels). 3) Unilateral action by all industrial countries to extend preferential market access for less developed countries, and to simplify eligibility criteria, especially rules of origin. 4) Affirmation by the WTO that core disciplines relating to the use of trade policy apply equally to all WTO members. 5) Acceptance of the principle that for small and low-income countries"one size does not fit all"when it comes to domestic regulation and to WTO agreements requiring substantial investment of resources. 6) Recognition that some WTO agreements need to be adapted to make them moresupportive of development, and a consequent willingness by industrial countries to modify them. 7) Expansion of development assistance to bolster trade capacity in poor countries and strengthening of the links between trade-related technical assistance and the mechanisms through which aid priorities are determined in developing countries. In practice, calls for specific types of SDT often appear to be motivated by a perception that a certain WTO rule is"anti-development"and that therefore developing countries should be exempted from the rule in question. The authors suggest that the appropriate solution to such problems is to change the rules rather than seek an opt-out. What should be up front changes in rules and what should be part of the negotiating agenda is a major issue which needs to be addressed at the Cancun Ministerial meeting. The suggestion that SDT should focus primarily on WTO rules and be limited to those countries that need it most-very small and poor economies-implies that criteria should be adopted to differentiate between countries. Leaving this to self-declaration-the current approach-is not feasible, while reliance on case-by-case, agreement-specific negotiation can generate excessive costs, discretion, and associated uncertainty. While the authors'preference is for a simple rule-of-thumb approach to determine eligibility, this is an issue that requires much more thought and discussion. They suggest that WTO members establish a high-level group to consider criteria that could be used for differentiation purposes and to determine the set of agreements to which differentiation will apply.Economic Theory&Research,Rules of Origin,Environmental Economics&Policies,Payment Systems&Infrastructure,Decentralization,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Economic Theory&Research,Environmental Economics&Policies,Poverty Assessment,World Trade Organization

Broadband phased array antenna steering by means of coherent signal combining in an integrated ring resonator-based optical beamformer

A squint-free, continuously tunable optical beamformer for broadband phased array receive antennas is proposed. The complete system is demonstrated, including E/O and O/E conversions, and optical signal processing. The latter involves delay synchronization and coherent optical combining, which is performed in an integrated ring resonator-based optical beam forming network, realized in low-loss, CMOScompatible TriPleX technology. Successful combination of four beamformer input channels has been demonstrated by means of RF-to-RF measurements

Novel ring resonator-based optical beamformer system and experimental results

A novel squint-free, continuously tunable beamformer mechanism for a phased array antenna system is proposed. It consists of filter-based optical single-sideband suppressed-carrier modulation, a fully integrated optical beam forming network using cascades of optical ring resonators as tunable delay elements, and balanced coherent optical detection. The proposed system brings advantages in optical bandwidth requirement, system complexity, and dynamic range, without introducing the problem of beam squint or limited tuning resolution. Some experimental results are presented in order to demonstrate the feasibility of the proposed concept

Phased array receive antenna steering system using a ring resonator-based optical beam forming network and filter-based optical SSB-SC modulation

A novel phased array receive antenna steering system is introduced. The core of this system is an optical ring resonator-based broadband, continuously tunable optical beam forming network (OBFN). In the proposed system architecture, filter-based optical single-sideband suppressed-carrier modulation and balanced coherent optical detection are used. \ud Such architecture has significant advantages over a straightforward architecture using optical double-sideband modulation and direct optical detection, namely relaxed bandwidth requirements on the optical modulators and detectors, reduced complexity of the OBFN chip, and enhanced dynamic range. Initial measurements on an actual 1×8 OBFN chip and an optical sideband filter chip are presented. Both are realized in CMOS-compatible planar optical waveguide technology.\u

RF photonics technology for phased array antenna applications

One of the key research topics of the Telecommunication Engineering (TE) Group at the University of Twente (UT) is RF Photonics. The aim of this field is to develop schemes that utilize the advantages of optical technology for performing RF functions in wireless communication systems. Examples of such functions are high-frequency filtering, frequency conversion, antenna remoting, and beam forming for phased array antennas. The TE Group is currently involved in several Senter and NIVR projects on RF Photonics that are related to phased array antenna applications

Anomalous Power Law Distribution of Total Lifetimes of Branching Processes Relevant to Earthquakes

We consider a branching model of triggered seismicity, the ETAS (epidemic-type aftershock sequence) model which assumes that each earthquake can trigger other earthquakes (``aftershocks''). An aftershock sequence results in this model from the cascade of aftershocks of each past earthquake. Due to the large fluctuations of the number of aftershocks triggered directly by any earthquake (``productivity'' or ``fertility''), there is a large variability of the total number of aftershocks from one sequence to another, for the same mainshock magnitude. We study the regime where the distribution of fertilities $\mu$ is characterized by a power law $\sim 1/\mu^{1+\gamma}$ and the bare Omori law for the memory of previous triggering mothers decays slowly as $\sim 1/t^{1+\theta}$, with $0 < \theta <1$ relevant for earthquakes. Using the tool of generating probability functions and a quasistatic approximation which is shown to be exact asymptotically for large durations, we show that the density distribution of total aftershock lifetimes scales as $\sim 1/t^{1+\theta/\gamma}$ when the average branching ratio is critical ($n=1$). The coefficient $1<\gamma = b/\alpha<2$ quantifies the interplay between the exponent $b \approx 1$ of the Gutenberg-Richter magnitude distribution $\sim 10^{-bm}$ and the increase $\sim 10^{\alpha m}$ of the number of aftershocks with the mainshock magnitude $m$ (productivity) with $\alpha \approx 0.8$. More generally, our results apply to any stochastic branching process with a power-law distribution of offsprings per mother and a long memory.Comment: 16 pages + 4 figure

On-chip, CMOS-compatible, hardware-compressive integrated photonic beamformer based on WDM

We propose and experimentally demonstrate a novel, hardware-compressive architecture for broadband and continuously tunable integrated optical true-time-delay beamformers. The architecture is based on on-chip wavelength division multiplexing (WDM) that, in conjunction with the frequency-periodic response of optical ring resonator (ORR) filters, dramatically reduces the network complexity and, in turn, its area occupation on the wafer. This allows the integration of an unprecedented number of delay channels on a single chip, overcoming the main limitation of current integrated beamformers, that is, the limited capability to feed very large arrays when using a single chip. Based on this technique, a novel device is realized with TriPleXTM waveguide technology, using CMOScompatible fabrication equipment, and its functionality is demonstrated over the instantaneous 2-10 GHz bandwidth. At the best of our knowledge, this results represent at the same time the record instantaneous bandwidth (8 GHz) for an optical beamformer based on optical ring resonators(ORR), and the first demonstration of an integrated beamformer where signals from different antenna elements are processed simultaneously by individual delay lines, exploiting the periodic response of ORRs

A compact and reconfigurable silicon nitride time-bin entanglement circuit

Photonic chip based time-bin entanglement has attracted significant attention because of its potential for quantum communication and computation. Useful time-bin entanglement systems must be able to generate, manipulate and analyze entangled photons on a photonic chip for stable, scalable and reconfigurable operation. Here we report the first time-bin entanglement photonic chip that integrates time-bin generation, wavelength demultiplexing and entanglement analysis. A two-photon interference fringe with an 88.4% visibility is measured (without subtracting any noise), indicating the high performance of the chip. Our approach, based on a silicon nitride photonic circuit, which combines the low-loss characteristic of silica and tight integration features of silicon, paves the way for scalable real-world quantum information processors.Comment: 4 pages, 5 figure