Which of the following is not an example of a barrier to entry?
A、Asoybeanfarmeristhefirstinhercountytouseanewbrandoffertilizer.;
B、MicrosoftobtainsacopyrightforitsWindowsoperatingsystem.;
C、Apharmaceuticalcompanyobtainsapatentforanewmedicationtotreatmigraineheadaches.;
D、AtaxicabdriverinNewYorkCityobtainsalicensetolegallyprovidetransportationinNewYorkCity.
发布时间：2024-06-11 22:20:03
