<prompt> Translate the following text to EnglishUpatikanaji wa gharama za utoaji ni hali muhimu kwa kuingia kwa ufanisi na kiwango cha heterogeneity itakuwa na jukumu muhimu katika kuamua udhaifu kwa kuingia kwa ufanisi.  <response>: Delivery cost heterogeneity is an essential condition for inefficient entry and the degree of the heterogeneity would play an important role in determining the vulnerability to inefficient entry. 