This may be explained by assuming that people begin to associate outsiders and foreigners with disease and danger while simultaneously associating health, freedom from disease, and safety with people similar to themselves.
這可藉由一種假定來解釋，即人們會開始將外人和外國人與疾病和危險聯繫在一起，同時卻將和自己類似的人與健康、免於疾病、及安全等關聯起來。