This paper extend j ? rgensen ’ s transport model by considering the influence of the number of passengers on travel time costs , and use the method of comparative statics analysis to discuss how travel distance affects the fare levels and the quality of transport supply . and it concludes some sufficient conditions to ensure optimal fare and optimal quality will increase when the travel distance becomes longer Rgensen的交通模型,利用比較靜態(tài)分析的方法討論了出行乘距對(duì)票價(jià)和供給服務(wù)質(zhì)量水平的影響,給出了一個(gè)新的保證最優(yōu)票價(jià)和最優(yōu)供給服務(wù)質(zhì)量水平會(huì)隨著出行乘距增加而增加的充分條件。