ምክንያቱም ስልቶች መደበኛ (Hedström and Ylikoski 2010) ለመግለጽ እጅግ አስቸጋሪ ናቸው ምክንያቱም በቀላሉ እጠቀማለሁ: ሎሚስ እና ስኳር (Gerber and Green 2012).
Chifukwa njira zimakhala zovuta kufotokozera mwachidule (Hedström and Ylikoski 2010), ndikuyamba ndi chitsanzo chophweka: limes ndi scurvy (Gerber and Green 2012).