Removing border protection on wheat and rice: effects on rural income and food self‐sufficiency in China*

In this paper, I use the Monash Multi‐Country model – a dynamic Computable General Equilibrium model of China, Australia and the Rest of the World – to analyse the effects of removing border protection on wheat and rice in China. The analysis points to the possibility that removing border protection on wheat and rice may lead to an increase in rural income in China. This is mainly due to the following two factors. First, removing border protection on wheat and rice not only leads to a contraction in agricultural activities, but also leads to an expansion in manufacturing and services activities. Second, on average, rural households in China obtain over half of their income from manufacturing and services activities.     

Dynamic general equilibrium analysis of improved weed management in Australia's winter cropping systems*

A recent analysis indicated that the direct financial cost of weeds to Australia's winter grain sector was approximately $A1.2bn in 1998–1999. Costs of this magnitude represent a large recurring productivity loss in an agricultural sector that is sufficient to impact significantly on regional economies. Using a multi‐regional dynamic computable general equilibrium model, we simulate the general equilibrium effects of a hypothetical successful campaign to reduce the economic costs of weeds. We assume that an additional $50m of R&D spread over five years is targeted at reducing the additional costs and reduced yields arising from weeds in various broadacre crops. Following this R&D effort, one‐tenth of the losses arising from weeds is temporarily eliminated, with a diminishing benefit in succeeding years. At the national level, there is a welfare increase of $700m in discounted net present value terms. The regions with relatively high concentrations of winter crops experience small temporary macroeconomic gains.     

调整财政民生支出和行政管理支出对劳动报酬的影响——基于CGE模型的收入再分配研究

文章通过构建反映财政支出结构的可计算一般均衡模型(CGE),对"行政管理支出和财政民生支出的调整对第一、二、三产业部门劳动报酬的影响"进行了系统的实证研究。CGE模拟结果表明,在财政支出总量增加、结构不变的情况下,行政管理部门劳动报酬增长过快,并且降低了其他部门的劳动报酬占比;其他部门的劳动报酬过低与财政行政管理支出和行政管理部门的劳动报酬增长过快有关;削减行政管理支出对国民经济各产业部门的劳动报酬具有正向影响;在财政支出增加的情况下,增大科技等财政民生支出比重对国民经济各产业部门劳动报酬的正向影响较为显著。     

基于CGE模型的环境税优惠政策的环保效应分析

通过建立一个CGE模型,并对该模型在存在和不存在环境税优惠政策两种场景下的社会产出、产品供应和社会福利状况进行模拟分析,考察环境税优惠政策的环保效应。结果表明,环境税的税收减免在长期内对社会福利的影响不大,但是,它却会对环境税的环境保护效果产生较大的负面影响。在使用税收减免工具时,政府要从社会福利和环境保护、能源使用等方面加以考虑,避免社会总福利的净损失。     

Do increases in energy efficiency improve environmental quality and sustainability?

Governments world-wide increasingly see energy efficiency as an important aspect of sustainability. However, there is a debate in the literature as to whether the impact of improved energy efficiency on reducing energy use might be partially, or more than wholly, offset through “rebound” and “backfire” effects. This paper clarifies the theoretical conditions under which such effects would occur and explores their likely significance using a computable general equilibrium (CGE) model of the Scottish economy. We find that for Scotland a general improvement in energy efficiency in the production sectors of the economy initially produces rebound effects that eventually grow into backfire. Energy use ultimately increases in response to an efficiency gain and the ratio of GDP to CO₂ emissions falls. The economic factors underpinning rebound effects are straightforward: energy efficiency improvements result in an effective cut in energy prices, which produces output, substitution, competitiveness and income effects that stimulate energy demands. However, the presence of strong rebound or even backfire does not mean that efficiency-enhancing policies are irrelevant: rather it suggests that such policies operating alone are insufficient to generate environmental improvements. The implication is that a co-ordinated portfolio of energy policies is required.     

Trade-induced productivity gains reduce incentives to impose strategic tariffs

Strategic tariffs, which raise an economy's welfare by restricting trade and improving the terms of trade, can create an obstacle to free trade. We evaluate how far trade-induced productivity gains (technology spillovers) reduce or remove this obstacle, because more intensive trade enhances these potential gains. Based on theory and the World Input-Output Database (WIOD) we estimate stronger import-induced than export-induced productivity gains. We feed the theory and the estimates into a global Computable General Equilibrium (CGE) model calibrated to WIOD. We find that the USA's, China's and the EU's optimal tariffs are reduced by less than 20%, Russia's and India's by around 25% and Brazil's by 40% when taking endogenous trade-induced productivity gains into account. Nonetheless, incentives for single economies to impose strategic tariffs persist. Particularly large, trade-intensive downstream sectors producing distinct goods incentivize high sectoral optimal tariffs. A global free trade agreement could overcome such incentives and maximize the trade-induced productivity gains.     

Russian Roulette at the Trade Table: A Specific Factors CGE Analysis of an Agri‐food Import Ban

In the summer of 2014 Russia imposed a ban on most agri‐food products from countries enforcing Ukraine‐related sanctions against Russia. We use a specific factors computable general equilibrium (CGE) model to simulate the short‐run impact of this retaliatory policy. The baseline is carefully designed to isolate the impacts of the ban on the European Union (EU), Russia itself and a selection of key trade partners. The modelling of the ban follows a novel approach, where it is treated as a loss of established trade preferences via reductions in consumer utility in the Armington import function. Not surprisingly, the results indicate that Russia bears the highest income loss (about €3.4 billion) while the EU recovers part of its lost trade through expansion of exports to other markets. An ex‐post comparison between simulation results and observed trade data reveals the model predictions to be broadly accurate, thereby validating the robustness of the modelling approach.     

National and Regional Impacts of an Increase in Value-Added Tax: A CGE Analysis for South Africa

The South African National Treasury expected a revenue shortfall of R48.2 billion in 2017/18 and proposed tax policy measures to raise an additional R36 billion in 2018/19. A key component to raise the additional revenue was a 1% point increase in the VAT rate to 15% effective from 1 April 2018. The increase in the VAT rate was not welcomed as it would increase the cost of living, especially for the poor. We investigate the potential economy-wide and regional impacts of raising VAT and increasing public spending on education and health. We do this by developing and applying a multi-regional model of the South African economy that includes detailed tax and spending features. In this model, when we increase VAT, the impacts are driven by the direct shock to the model, accompanied by differences in regional economic activity. We find that effects on GDP vary between regions but are generally negative.     

Trade liberalization and income inequality: The case for Pakistan

Trade liberalization policies have been adopted by many developing countries to increase economic growth and reduce poverty. While the positive relationship between trade liberalization and economic growth is generally well accepted, the impact of trade liberalization on poverty and income inequality is still unclear. The objective of this paper is to use real data and real trade agreements of the state of Pakistan, to examine the predictions made by trade models about the impact of trade liberalization on income inequality. To illustrate, the impacts of several alternative bilateral and regional free trade agreements are simulated on household income and income inequality in Pakistan. The results show that trade liberalization does not always lead to a decline in income inequality in the short run. Trade agreements that do improve income equality, favor agriculture and often hinge on a decline in urban and non-farm household income. In the long run, changes in income equality are more positive, suggesting that efforts might best be applied towards improving the mobility of labor and capital.