This dissertation addresses food security problem from three alternative perspectives. The first essay analyzes the total factor productivity and climatic effects on milk production in Wisconsin dairy farms. This essay employs a recent developed stochastic production frontier method to quantify the impacts of seasonal factors and longer-term adaptive effects on output, which is a novel contribution to the literature. What is more, based on the results from generalized true random effects model, this essay employs a total factor productivity index and its six components to evaluate the competitiveness between farms and to explore strategies to increase productivity for milk production. The second essay identifies the barriers for buyers and ...