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Focuses on the role of protein levels in determining the impact of protein premiums and discounts on a grower's income stream in Australia. Correlation between wheat price and yield for variance of income; Development of a model in relation to a grower's willingness-to-pay for a forward contract; Results of a numerical analysis of the model.

This article discusses the principal claims made for the Resource Rent Tax (RRT) by Garnaut and Clunies-Ross (1975, 1979) relating to its efficiency and potential for generating tax revenue relative to other forms of resource taxation, and also their concern about the greater uncertainty of these revenues. An analysis of the risk-return trade-off associated with a shift from ad valorem royalties to an RRT finds this shift to be worthwhile. Estimates are also provided of the foregone tax revenue from the North West Shelf associated with the use of ad valorem royalties rather than the RRT. [ABSTRACT FROM AUTHOR]

This article analyses the modified form of ad valorem royalty recently announced by the WA government in relation to gold production, which features a threshold price below which there is no tax liability and compares this royalty with a profit-based royalty. The level at which the threshold price is set plays an important role in determining the performance of the royalty in relation to its impact on production and the expected level and variability of tax revenue. It is argued that the higher this price is set, the stronger the grounds for preferring a profit-based royalty, even taking into account the reliability of each form for generating tax revenue. [ABSTRACT FROM AUTHOR]

This article extends the analysis of the impact of a system of protein premiums and discounts to that on a farmer's planned production. Despite an unambiguously negative impact on expected profits of equally likely premiums and discounts, supply response to the introduction of such a system is shown to depend on the level of seasonal variability faced by the farmer. In particular, farmers in regions which are more seasonally unreliable are likely to feature a negative supply response, whereas those in regions which are more seasonally reliable are likely to feature a positive supply response. Consequently, it is suggested that, overall, protein payments for wheat may have encouraged a shift of wheat-growing activity away from more seasonally unreliable areas. [ABSTRACT FROM AUTHOR]

The article discusses study by John Quiggin and Jock Anderson on risk in agriculture. Topics discussed include economic analysis of production decisions under price and/or yield uncertainty, academic contributions made by Australian economists in the context of minerals and energy policy, and importance of water in agricultural production.

International trade of agricultural products not only generates wealth but is also responsible for the introduction of invasive pests beyond their natural range. Comprehensive bioeconomic modelling frameworks are increasingly needed to assist in the resolution of import access disputes. However, frameworks that combine welfare analysis attributable to trade and invasive species spread management are lacking. This study provides a demonstration of how a comprehensive economic framework, which takes into account both the gains from trade and the costs of invasive species outbreaks, can inform decision-makers when making quarantine decisions. We develop a partial equilibrium trade model considering international trade and combine it with a stratified dispersal model for the spread and management of potential outbreaks of an invasive species. An empirical estimation is made of the economic welfare consequences for Australia of allowing quarantine-restricted trade in New Zealand apples to take place. The results suggest the returns to Australian society from importing New Zealand apples are likely to be negative. The price differential between the landed product with SPS measures in place and the autarkic price is insufficient to outweigh the increase in expected damage resulting from increased fire blight risk. As a consequence, this empirical analysis does not support the opening up of this trade. [ABSTRACT FROM AUTHOR]