I have understood that many of the economic operations must have a certain strategy: a kind of game in which you must not only move pieces, but also know when. In particular, I must thank you very much for supporting others with your vote. Likewise, I want to show the satisfaction and pleasure I get from reading you. In fact, I remember telling you that I once used a text of yours to explain an analogy with my students. My admiration and respect for you, @tarazkp and a better happy 2021, in case I don't read you tomorrow. Hugs :D