yanner39
Emperor
I'll take a stab in the dark and guess that he means researching it with 0% slider for a turn and then try to trade it for a tech that has the same base price (Aes/Alpha) to "fine-tune" the trade. Before Currency it can be important to milk the best trades possible (i.e. to not research unneeded "extra" beakers when planning on trading the rest of the way) as there is no possibility for cash to buffer lopsided trades.
But how can he trade Monarchy if he hasn't researched it? He researches it at 0% slider, meaning he's not really researching it, and then trades it for another tech? I don't get it.

EDIT: On the subject of trading techs, it's pretty amazing how more advance players are able to research tech with the goal of trading it for another. This is what I have trouble wrapping my head around. Deciding to research a tech and being able to say that the AIs won't have that tech but will want it and will be willing to trade the tech I actually want. In my games it seems that when I make a trade request, the AI always says he's not willing to trade the tech I want just yet.