agriculture agricultureandstate balanceoftrade business commercialproducts commodities commodityexchanges congresses developingcountries developmenteconomics economicaspects economicconditions economicdevelopment economics farmproduce foodindustryandtrade globalgovernance globalization internationaleconomicrelations internationaltrade investments latinamerica mathematicalmodels preisentwicklung pricemaintenance prices pricing producetrade risk securities welthandel weltwirtschaftskrise wirtschaftsentwicklung