新一轮国际粮食价格上涨：原因及对中国市场的影响

[目的]随着中国粮食进口不断增加,国内外市场联系越来越紧密。2020年下半年以来,国际市场粮食价格快速上涨,对国内粮食市场产生一定影响,分析国际市场价格上涨的原因和影响对确保国内粮食供应稳定、保障国家粮食安全具有重要意义。[方法]文章分析了2019年以来小麦、大米、玉米、大豆4种粮食产品的国内外价格走势,从供需状况、贸易政策、气候变化等因素分析国际市场价格波动的原因,并探讨了国际价格对国内价格的影响。[结果]当前全球主要粮食品种供应充足,库存仍处于较高水平,此轮国际粮食价格上涨主要是受到美国等发达国家宽松的货币政策以及疫情后全球消费逐步回暖的影响;但国际市场价格上涨对中国市场的影响总体有限,国内小麦、大米、玉米价格上涨的主因是国内消费回暖和生猪产能恢复带动的饲用需求快速增长,油用大豆受国际市场的影响较大。[结论]为稳定国内粮食市场,避免国际市场的冲击,中国要进一步提升粮食综合生产能力,强化科技支撑,加强粮食储备管理,健全政策支持体系,并引导居民建立科学的消费观念。     

最低收购价政策调整对我国粮食安全的影响——以稻谷为例

[目的]最低收购价政策实施以来,在稳粮价、促生产、保粮安的同时,也产生了显著的负面影响,探索以市场机制为核心的粮食价格支持政策改革势在必行。[方法]文章以稻谷为例,通过构建局部均衡模型,模拟逐渐下调最低收购价、取消最低收购价、取消最低收购价并大幅增加农业补贴等方案对我国稻谷的产量、总消费、库存和净进口等方面的影响,进而探究最低收购价政策调整对我国粮食安全的影响。[结果]（1）下调稻谷最低收购价,对稻谷市场价格、总产量和总消费的影响较小,而对库存和净进口量的影响较大;（2）取消最低收购价,虽然能大幅度减小国内外差价、库存量和进口量,但短期内也会显著减少稻谷产量,对我国的粮食供给安全带来了巨大冲击;（3）取消稻谷最低收购价,并大幅度提高了农业补贴后,稻谷总产量下降水平明显减少,既解决了托市收购带来的负面影响,也降低了取消托市收购对粮食供给安全的冲击。[结论]最低收购价政策的支持效应显著,为充分保障国内粮食安全,在推行粮食市场化改革时,应首先考虑小幅度下调最低收购价,而不是一次性取消最低收购价政策;同时,要配套相应的补贴政策,优化农业补贴结构,来保障粮农的种植积极性。     

Evaluation of the Influence of Agricultural Price Policy on Cotton Production in Côte-d'Ivoire

In this paper the impact of the cotton pricing policy of the marketing board of Côte-d'Ivoire is investigated. A theoretical model is developed to derive the price level which maximizes revenue generated from the marketing board's cotton transactions. A dynamic cotton supply function was estimated and used to compute elasticities. The estimates indicate that farmers in the Country response to price changes and that the pricing policy of the marketing board has been consistent with an objective of generating revenue for the government.     

UNDERWRITING AGRICULTURAL COMMODITY PRICES

Underwriting schemes are increasingly being used as a basis for price policy in Australian agricultural industries. These policies simultaneously increase average returns and reduce the risk faced by producers. In this paper, conditions are discussed under which such a combination of policy targets may be desirable. The optimality properties of underwriting schemes in achieving these targets are examined and compared to those of alternative schemes. Aspects of underwriting scheme design are discussed.     

PRICE-SUPPORT EFFECTS ON EC PRODUCERS

This paper presents a new approach to assessing the impact of price-support policies on producer behaviour. This approach takes explicit account of the impact of such policies on a producer's uncertain production environment and includes a numerical procedure for calculating ex ante price variability from ex post producer price data. The method is applied to European Community agricultural industries in which intervention purchasing schemes operate. The results show the extent to which price support-policies distort the signals producers receive from world markets.     

The Impact of Cereal Prices and Policy on Crop Rotations and Supply Response

The impact of cereal prices on rotational decisions and farm‐level and industry cereal supply is considered. It is argued that with the voluntary 50 per cent set‐aside option for cereal producers, there is a large financial incentive to adopt a 50 per cent set‐aside cropping plan as cereal prices fall below an individual producer's ‘indifference’price. For a typical 210‐hectare UK combinable crop farm, adopting a 50 per cent set‐aside cropping plan is optimal when the price of cereals is below £62/tonne (98.50/tonne). If widely adopted, 50 per cent set‐aside will lead to a substantial fall in the supply of cereals and would lead the industry supply curve for cereals to move leftward and become more elastic over a certain price range. The level of reduced cereal supply will be greater than would be predicted from an estimate of industry level supply response that ignored rotational and farm‐level financial incentives.     

UNDERWRITING ASSISTANCE TO THE AUSTRALIAN WHEAT INDUSTRY — AN APPLICATION OF OPTION PRICING THEORY

For the ten crop seasons 1979-80 to 1988-89, returns to producers in the Australian wheat industry were underwritten by a government-guaranteed price floor. Similar schemes operate in other rural industries (dairy, apples and pears, dried fruits). Although the underwriting provisions have only been triggered once (in the 1986-87 season), the provision of this scheme has acted to reduce the risk normally associated with returns to producers of wheat in all years of its operation. This reduction in risk has been granted free-of-charge by the Commonwealth Government. The guaranteed price can be viewed as a put option taken out by the Government on behalf of growers — it gives growers the option to sell to the Australian Wheat Board at this floor price. The aim of this paper is to apply to this underwriting arrangement the Black-Scholes formula for valuing options, in order to estimate the cost that growers would otherwise have had to pay to obtain cover (through put options) equivalent to the guaranteed price. We also estimate the magnitude of this form of assistance to the industry, which (until now) has not been taken into account unless the returns to growers fell below the guaranteed price.     

Expectations,supply response,and marketing boards: An example from Kenya

Whether farmers form price expectations adaptively or in a forward-looking manner has implications for supply response analysis and for the implementation of agricultural policy reform. This paper examines the formation of price expectations by Kenyan export-crop farmers who market their produce through a monopsonistic parastatal. The analysis allows for relaxation of the small-country assumption within a rational expectations framework. Production behavior is consistent with expectations of future prices based on indicators of aggregate supply and of the marketing board's purchasing capacity. The finding that price forecasts may be formed using information other than previous price levels implies that marketing reforms that raise prices may not raise the relevant price expectations. To elicit a positive supply response, market reforms should be sensitive to farmers' interpretation of institutional signals as well as previous prices.     

Compensated optimal response under uncertainty in agricultural household models

This study derives the qualitative properties of a household's optimal consumption, family labour, hired labour and non-labour input choices under price and/or output risk through a Slutsky-type compensation without imposing any restriction on risk preference structure or production technology. These compensated responses provide the underpinning for welfare analysis in agricultural household models under risk. The framework for the evaluation of welfare effects of product and factor price interventions in a setting of output and price risk is developed. The paper also outlines an empirical model for estimation of the compensated demand and supply responses and for validation of the paper's analytical results.     

Industry consolidation and price in the US linerboard industry

Starting from the 1980s, the US paper and paperboard industry has recorded an increasing degree of consolidation through mergers and acquisitions. This strategy, combined with voluntary downtime, is adopted by producers as a method to tackle excess capacity and to reduce costs in order to improve profitability. In this study, we investigate the impact of industry consolidation on price in the linerboard industry. We estimate a dynamic demand/supply system model that explicitly incorporates market structure. We find a low own-price elasticity of linerboard demand and an insignificant substitute effect of plastic containers. Additionally, linerboard price does not seem to respond to current demand and adjusts slowly across time. Moreover, industry-operating rate shows a positive, statistically significant, but small impact on price. Although those findings suggest an oligopoly market and some degree of barometric price leadership, market concentration shows no statistically significant effect on price.     

The impact of different land-supplying channels on the supply of housing

As Hong Kong's property prices have been skyrocketing particularly in the last several years, housing has become even less affordable than it was prior to the Asian Financial Crisis, compromising Hong Kong residents’ living standards. The general public mostly blames the supply-side actors (i.e. property developers and/or the government) for such a predicament, and vociferously demands for higher supply of residential flats both in the private and public sectors. The government, in response, proposes the supply of more residential land, among other measures, in addressing the public's demands, with the notion of “higher land supply results in higher housing supply”. Nonetheless, there are other channels, other than land sale, which provide land for housing construction, such as land exchange, which are usually overlooked in public debates. In the light of this, this paper aims to investigate the respective impact of land sale and land exchange on Hong Kong's housing supply. The findings, interestingly, show that land exchange has a much larger long-run impact on housing supply than land sale does; that housing supply responds to short-run fluctuations in property price; and that best lending rate has neither a short- nor long-run relationship with the supply of housing. The reason behind the finding regarding land sale and land exchange is that, the former is initiated by the government which overlooks property developers’ profit incentives and development strategies, while the latter essentially reflects that a particular land site is ripe for development (i.e. profitable) from the developers’ standpoint. Some implications relating to the recently announced government land policy measures are also discussed.     

Imperfect Price Transmission: Is Market Power Really to Blame?

Several studies in the literature have argued that price transmission in vertically‐related markets is imperfect, i.e. that farm input price changes are not fully passed‐through to the final product price. Market power, notably oligopoly, is presumed to be the principal source of imperfect price transmission. To date, the impact of oligopsony (buyer) power on the degree of price transmission has not been evaluated using a formal theoretical model. Moreover, neither has the combination of oligopoly and oligopsony despite the fact that its influence has been formally acknowledged in both the UK and some European food markets. This paper makes a contribution to the literature by developing a model of price transmission where both oligopoly and oligopsony power co‐exist and where industry technology is assumed to be characterised by variable input proportions. It shows that taking the degree of price transmission in a perfectly competitive market as a benchmark, oligopoly and oligopsony power do not necessarily lead to imperfect price transmission, although they can. Indeed, they may counteract each other's impact on the degree of price transmission. The key to these outcomes is to be found in the functional forms for retail demand and farm supply.     

AN ANALYSIS OF WILLINGNESS-TO-PAY FOR CROP INSURANCE*

In this paper a method for estimating a producer's willingness-to-pay for crop insurance is presented. The method includes formulae to capture the impact of crop insurance on the producer's expected income and variance of income. These impacts are evaluated in the context of a model of producer welfare which features both price and yield uncertainty, as well as risk aversion on the part of the producer. The method is applied to the Australian wheat industry and estimates of willingness-to-pay are shown to be relatively sensitive to the levels of coverage and yield variability.     

PRICE STABILIZATION THROUGH DEFICIENCY PAYMENTS*

Given a goal of farm price stabilization, the likely effect of a deficiency payment scheme on U.S. hog prices and production is examined for the period 1957 through 1971. A graphic model of supply and demand adjustment is first presented, and empirical results arc then reported. The model output refers to average price to packer and farmer, price variance, changes in farm income, and income variance. The analysis suggests that a deficiency payment scheme would have been modestly successful in achieving likely policy goals. Ay ant pour but la stabilisation des prix agricales, eel article étudie, pour la période de 1957 a 1971, ? effet probable ? un système de versements ? appoint sar le prix et la production des pores attx Etats-Unis. On y présente un graphique sur ? ajustement de ? offre et de la demande suive ? 'un rapport des résultats empiriques. Le graphique indique le prix moyen x ? abatteur et à? agricultettr, la variationdes prix, les changements dans les revenus agricoles et la variation des revenus. ? analyse indique qu'uti système de versements ? appoint aurait oblenu un certain succès en atteignant les bins proposés.     

Determination of the international maize price: What is the growing role of Brazil and Ukraine?

This paper examines the relationships among maize prices for four countries to determine if newly emerging exporters, Brazil and Ukraine, influence the international price of maize. Our work focuses on each market's participation in the price discovery process rather than trying to determine a price leader. We find that the United States plays the largest role in price discovery, followed by Argentina, Brazil, and Ukraine. We also search for export thresholds and find that Ukraine's contribution to price discovery rises slightly when an export threshold of 2.3 million tons is reached. No export thresholds were found for Brazil. Export thresholds for Argentina were found but only have a minor impact on price relationships. We also found that price relationships vary considerably across seasons of the year.     

Econometric analysis of expected price formation

The current report analyses the process of producers' expected price formation through the estimation of supply functions, using vegetables and green tea in Japan as an example. At first, theoretical analysis shows that the factors which transform the producers' expected price formation from the lagged expectation to the rational expectation are as follows: decrease in information price, increase in managerial ability and/or organizational innovation, rightward shift of supply curve, and increase in price elasticity in supply curve. Second, supply functions are estimated by using the price expectation formation which include the rational expectation and the lagged expectation as its extreme form. Consequently, producers' price expectations were found to approach the rational expectations in the case of Chinese cabbage, lettuce and green tea, whose supply curves show high price elasticities, and whose producers' organizations gather price information and monitor the production more than other crops taken in this paper.     

高致病性禽流感对中国家禽市场分割程度的冲击及滞后性影响研究基于中国省际面板数据

目的 基于中国省际面板数据,采用相对价格法测算2001年1月至2017年12月中国家禽市场分割指数,在此基础上使用阿尔蒙分布滞后模型检验了高致病性禽流感对中国家禽市场分割程度的冲击及滞后性影响。方法 文章运用相对价格法测算家禽分割指数,同时使用阿尔蒙分布滞后模型进行计量回归。结果 研究发现,高致病性禽流感对家禽市场造成严重负向冲击：不仅在短时间内阻碍省际间家禽市场流通,更是长期加剧省际家禽市场的分割。疫情发生的当月禽类感染型禽流感对家禽市场分割程度的影响小于人感染型禽流感;随着滞后期的推移,禽类感染型禽流感对家禽市场分割程度造成的即期滞后影响和累积滞后影响均大于人感染型禽流感。结论 中国政府不仅要关注高致病性禽流感发生时疫情的防控和家禽养殖户的补偿,也要充分考虑疫情结束后停养、休市、限运等政策对家禽市场带来的滞后性影响,完善补偿和市场价格机制,正确引导家禽养殖户以及其他利益相关者恢复信心,确保家禽市场稳定。     

Measurement of greenhouse gas emissions from agriculture: economic implications for policy and agricultural producers*

If agriculture were to be included in Australia’s carbon price scheme, a key decision for government would be how to estimate greenhouse gas emissions. We explore the consequences of three different methods for measuring on‐farm emissions: national accounting methods, an amended version of those methods and use of best‐available local data. Estimated emissions under the three methods can vary widely; for example, on a case study farm in Western Australia, local data indicated 44 per cent lower emissions than did the national accounts method. If on‐farm emissions are subject to an emissions price, the impact on farm profit is large and varies considerably with different measurement methods. For instance, if a price of $23/t of CO2‐e applies then farm profit falls by 14.4–30.8 per cent depending on the measurement method. Thus, the choice of measurement method can have large distributional consequences. On the other hand, inaccurate measurement results in relatively minor deadweight losses. On‐farm sequestration through reafforestation may lessen the impact of an emissions price on farm businesses, although it will require a high carbon price to be viable, especially if sequestration rates are underestimated or low.     

PPP水利工程供水价格机制研究

日渐突出的水资源供需不平衡,已成为中国经济社会可持续发展的重要制约因素。水价的杠杆作用是调节政府供水经营者用水户三方利益的重要手段,制定科学合理的水价有利于鼓励社会资本参与水利基础设施的建设,促进水资源优化配置和节约用水、保障用水户用水需求。在通过PPP物有所值评定测算的前提下,既充分考虑用水户的支付意愿和承受能力,又考虑供水经营者的成本补偿和合理收益,探究目前中国PPP模式下水利工程的水价核算情况。目前中国PPP模式下供水价格机制有所创新,但动态调整机制尚有不足。价格听证制度不断完善但公众参与程度仍需加强。     

农业水价形成机制的建构与检验以四川武引灌区为例

[目的]以四川武引灌区为案例，实证检验农业水价现实运行情况与农业水价形成机制的契合程度，探讨优化农业水价形成机制的基本方向。[方法]文章从市场和政府两个维度分析农业水价影响因素，建构“成本导向、支付可行”的农业水价形成机制，科学测定农业水价的弹性区间。[结果]市场作用下，供给维度要以供水工程成本为基准，需求维度在用水户承载力支付能力区间较为合理；由于农业用水具有正外部性以及农业供水的垄断性，政府应为农业用水构建合理的价格机制。农业水价构成应以平均运行可变成本为最低参考标准，也可实行全成本农业水价，以此符合“成本导向”。“支付可行”表现为实际支付能力和心理支付意愿，农业水价既要考虑农业生产中投入产出情况，判断用水户实际支付能力，又要研究其心理支付意愿，分析现实情况和心理参照点的差别情况。[结论]农业水价形成机制的学理建构与现实运行具有内在逻辑一致性，优化农业水价形成机制重点包括两个方面，即优化“成本导向”形成机制，科学建立灌区成本核算体系，完善农业用水价格制定准则，确立农业用水计收方式。优化“支付可行”形成机制，积极促进用水户增收，提高水价实际支付能力，强化宣传提高用水户心里支付意愿及加...