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There has also been tremendous growth in sales of irrigation systems , which together with increased fertilizer use , has the potential to boost grain yields considerably , especially in areas of marginal rainfall . Much of what 's left is of marginal additional value and is exorbitantly priced . " Some would say that it is too idealistic to believe in a society based on tolerance and the sanctity of human life , where borders , nationalities and ideologies are of marginal importance . The paper identifies that transaction cost , definition and allocation of initial emission rights , differential of marginal abatement costs , numbers of enterprises involving emission trading scheme are the key elements and factors that influencing the decisions and behaviors of enterprises in China . With these small motifs , painted with imagination , a light touch , and subtle coloration , the Limbourgs renewed the tradition of using grotesques for miniature borderwork by liberating them from the conventional matrix of marginal decoration .