What is it then that [you need] in this journey where measuring your output is so hard? This entire field of economics [is] where you can measure the output of the thing but never measure the output of the members of the team. Sometimes, it could be frustrating; sometimes, it could be exciting because your team did very well, and you knew you contributed.
What are these things that you need? Of course, you must have self-discipline. We often confuse this with zest and enthusiasm. Why? Much of the work is not like reading a book, then it turns out to be boring, so you put it down.