The two models focus on identifying locations and associated operating times for farmers’ markets to maximize accessibility to all people in terms of travel distance. The PMP, or 'p-median problem', is a a mathematical formula used to asses a range of variants. Based on this PMP, this range of variants in the study can be explored more thoroughly. Additionally, studies have investigated alternative ways of modeling travel distance/time such as public transportation.
Tong, D., Ren, F., & Mack, J. (2012). Locating farmers’ markets with an incorporation of spatio-temporal variation. Socio-Economic Planning Sciences, 46(2), 149-156.