The paper proposes an econometric model for agricultural and food exports, focusing on models regarding New Zealand, South Korea, and Romanian mountain areas. The models for 2002–2040 reveal that these countries are integrated into the agricultural global value chain. The economic model supposes a common export framework for three world economies different in structure, but similar in exports and mountain areas. The paper confirms that tariff barriers and agricultural mountain areas affect positively exports. The paper demonstrates that the export policies of agricultural and food sectors, especially mountains, of a country or a region are influenced, on a macroeconomic level, by most-favor-national clause, the multitude and the clauses of agreements, tariff and non-tariff barriers of the country, promotion of domestic exports, applying mountain development goals, promoting mountain products. At the microeconomic level, exports are determined by farm management, farmers' support, agricultural and food education with a focus on mountain product consumption, benefits awarded for the mountain activities through compensations, and more integrative issues for farmers. The paper's final purpose and solutions consider the mountain area's sustainability, offering the most healthier solutions for future foods.