In the modern industrial age, the demand for /technical personnel is much more than in the feudal age because the demand for goods is much more owing to increase in population and other factors. Hence, the traditional feudal method of teaching a craft, in which only a handful of persons were taught, would no longer / for modern society.
 
Now, technical institutes or engineering colleges, where a large number of students are taught technical skills, have become ____. Obviously, all these students could not be sons of the teacher. This / the very basis of the caste system in which one had no option in choosing one’s vocation and had to follow one’s father’s profession. The caste system, in which one’s vocation is chosen by one’s birth, is thus totally / in the modern age.