type="main" xml:id="ajar12063-abs-0001" <p>A positive relationship between farm size and farm productivity is often considered to be largely due to increasing returns to scale in farm production. However, using farm-level data for the Australian broadacre industry, we found that constant or mildly...</p>

type="main" xml:id="ajar12045-abs-0001" <p>Several complicating issues arise in evaluating the returns to research into varietal improvements for perennial crops compared with annual crops. We elucidate and address these issues in the context of a case study of research aiming to develop varieties...</p>

type="main" xml:id="ajar12047-abs-0001" <p>Carbon sequestered through increased forest biomass provides a low cost means to curb emissions and has become a major focus of New Zealand's Emissions Trading Scheme. We present a forest planning optimisation model where land use is governed by forest...</p>