农业水价综合改革的推进困境及成因分析——基于小农户风险视角

农业水价综合改革在部分地区进展相对滞后。利用制度变迁及制度配置理论,分析了农业水价综合改革推进困境的特征及成因。结果表明,农业水价综合改革推进困境的主要特征是部分地区小农户对农业水价提高的接受意愿较低,客观上造成精准补贴和节水奖励难以发挥作用。该困境的核心成因是奖补政策无法缓解改革中的小农户风险,具体表现为:小农户对已有非正式农业用水制度的路径依赖,催生了对农业水价新制度的适应风险;农村社会保障制度等相关初级制度不够完善,加剧了农业水价提高后小农户的生产和生活风险。提出应因地制宜地设计农业水价改革的微观主体管理模式,将生存灌溉补贴和农业保险补贴纳入奖补政策,完善农村基础设施和社会保障体系。     

多株高糖面包酵母生理特性比较

高糖面包酵母作为微生物发酵剂和疏松剂,主要用于面包、甜馒头等高糖发酵类食品的生产.目前,我国销售的高糖酵母生理特性差异很大,为了节约生产成本、提高面包产品质量,本实验通过测定4种市售高糖面包酵母的冷冻存活率、蔗糖酶活力、耐糖性以及高糖发酵力,来了解各品牌酵母的功能特性,筛选出各项指标均较为优秀的市售高糖面包酵母.实验表...     

基于耕地保护的中国城镇化发展战略研究

研究目的：研究中国城市位序 — 规模规律的演化和城市建成区人口密度同城市规模关系的变化,预测未来城镇化发展占用耕地情况,提出基于耕地保护的中国城镇化发展对策建议。研究方法：文献资料法、回归分析法和函数模型预测法。研究结果：中国城市建成区人口密度随城市人口规模的增加而增加,但正在快速下降,中国城镇化同耕地保护之间的矛盾日益突出。研究结论：为更加有效地保护耕地,中国应加快制定以发展大城市为主导,各级城市城镇全面发展的城镇化战略,推行高人口密度的城镇化发展政策措施,走紧凑型城镇化道路。     

How do Agricultural Programmes Alter Crop Production? Evidence from Ecuador

Evaluating agricultural programmes requires considering not only the programmes’ influence on input and output indicators, but also considering the relationship between these indicators as embodied in the production technology. This article examines the impact on production of an intervention in the Ecuadorian Sierra designed to improve returns to potato production through training and through linking smallholders to high‐value markets. Critical to identifying the impact of the programme is the careful construction of a counterfactual and meticulous data collection. To assess the impact of the programme on production, a weighted estimation, where weights are constructed through propensity score matching, is employed to estimate a production function within a damage abatement framework. The function incorporates a series of interaction terms to assess the impact of the programme on the production technology. The findings provide evidence that the programme enhances yields both through a general shift in technology as well as increased input use. The results suggest that the use of effective farming techniques that are learned through the programme induce this technological shift.     

Optimal rotation with declining discount rate

In recent years it has been argued, from many perspectives, that the further into the future a value flow occurs, the lower is the appropriate discount rate for it. National governments are now beginning to authorise such declining discount rates. This viewpoint can be, and has been, formalised in various ways, and has been applied to evaluating forestry investments of given durations. When the optimal duration of investment is itself the issue, new problems arise. Lower discount rates make subsequent rotations longer than earlier ones, and for a given length more valuable than they would otherwise be. This affects the optimal length of earlier rotations, which in turn may affect the discount rate profile applicable to later ones. In the absence of analytical solutions for the optimal sequence of rotations, numerical protocols are needed. The results arising are mostly in accord with expectations. If the change of discount rate is due to expected changes of circumstance that are actually realised, then the optimal sequence of rotations will remain as initially determined. If, however, it is due merely to the particular time perspective of the present generation, rotations will be revised by future generations. This will lead to a sequence of rotations similar to that deemed optimal at the current short-term discount rate. The most important reductions in profitability caused by choosing the “wrong” discounting protocol arise from the “wrong” rate, rather than by using declining rates as such.     

Do the EU countries import at the same price? The case of coffee

The establishment of the Economic and Monetary Union was expected to determine price convergence in the market of the European Union, leading to the equilibrium theorized by the law of one price. This article investigates prices convergence in the coffee market among European importers. Coffee is not only a tradable and traded good, but also one of the most valuable traded commodities. We account for different qualities of coffee in a hedonic regression model, which isolate and remove the effects of factors that might affect price dispersion. Adjusted import prices result to be significantly different between European Member States, and do not support the hypothesis of a deepening European market integration.