High vulnerability to crisis The results of the BTI 2020 in the context of COVID-19. BertelsmannStiftung Policy Brief 2020/01

In most of the 137 developing and transformation countries examined by the BTI 2020, COVID-19 will exacerbate the very weaknesses that have marked the negative balance of the last decade: a lack of rule of law, limited political rights, fiscal instability and rising social inequality

The Proliferation of Fiscal Incentives and the Nicaraguan State as a Manager of Rents: A Political Economy Perspective on Nicaraguan Industrial Policy Since 1990

This paper finds that the proliferation of fiscal incentives in the form of tax exemptions in Nicaragua since 1990 represents the indiscriminate allocation of monopoly rents to interest groups. While theory suggests some rents can encourage productive investments, Nicaragua’s tax incentives are merely “assistentialist” and lack effectiveness. For a dynamic industrial policy, opportunity costs would need to be taken into account and rents would need to be performance contingent, which requires selectivity and increased transparency.Nicaragua; industrial policy; political economy; fiscal incentives; tax incentives; monopoly rents; rent-seeking

Trapped-ion quantum simulation of excitation transport: disordered, noisy, and long-range connected quantum networks

The transport of excitations governs fundamental properties of matter. Particularly rich physics emerges in the interplay between disorder and environmental noise, even in small systems such as photosynthetic biomolecules. Counterintuitively, noise can enhance coherent quantum transport, which has been proposed as a mechanism behind the high transport efficiencies observed in photosynthetic complexes. This effect has been called "environmental-assisted quantum transport" (ENAQT). Here, we propose a quantum simulation of the excitation transport in an open quantum network, taking advantage of the high controllability of current trapped-ion experiments. Our scheme allows for the controlled study of various different aspects of the excitation transfer, ranging from the influence of static disorder and interaction range, over the effect of Markovian and non-Markovian dephasing, to the impact of a continuous insertion of excitations. Our proposal discusses experimental error sources and realistic parameters, showing that it can be implemented in state-of-the-art ion-chain experiments.Comment: 14 pages, 11 figure

Fundamental Limits of Energy-Efficient Resource Sharing, Power Control and Discontinuous Transmission

The achievable gains via power-optimal scheduling are investigated. Under the QoS constraint of a guaranteed link rate, the overall power consumed by a cellular BS is minimized. Available alternatives for the minimization of transmit power consumption are presented. The transmit power is derived for the two-user downlink situation. The analysis is extended to incorporate a BS power model (which maps transmit power to supply power consumption) and the use of DTX in a BS. Overall potential gains are evaluated by comparison of a conventional SOTA BS with one that employs DTX exclusively, a power control scheme and an optimal combined DTX and power control scheme. Fundamental limits of the achievable savings are found to be at 5.5 dB under low load and 2 dB under high load when comparing the SOTA consumption with optimal allocation under the chosen power model.Comment: 12 pages, ISBN 978-1-4577-0928-9. In Future Network & Mobile Summit (FutureNetw), 201