http://slatestarcodex.com/2015/09/22/beware-systemic-change/The author of the above is an "Efficient Altruist", which signals to me an understanding of economics.
The entire post is an excellent warning about unintended consequences (though he never uses those words) and the danger of focusing on what you think the results of political change will be.
He likely disagrees with me on several issues, but I have to applaud not only his self-awareness, but his understanding of his political opponents.
Most impressive (in that vein) was this:
...As for opposing gay marriage, I think you’re going beyond your supposed reliance on evidence here. The strongest conservative case against gay marriage is that it reinforces a centuries-long redefinition of marriage from a strategic partnership focused on child-rearing to a ceremonial acknowledgment of romantic infatuation, potentially leading to a deep shift in the way people think about issues like who to marry, when to have kids, when to get divorced, and how to treat their family. That argument hasn’t been rigorously evaluated by statisticians and found wanting. It’s been found annoying and left untouched. Your differences are foundational assumptions and methodological disagreements about what sorts of issues to focus on, not simple “he made an arithmetic error when calculating the effects” style obvious superiority.
Please note, this is not a gay marriage post, but a post about being wary of limitations and not paying attention only to observable, measurable (at the time, at least) results and ignoring the unseen, less measurable results of a policy preference. From that, he leads into being wary of alienating others and creating zero-sum games with outcomes that are not necessarily beneficial.
The entire piece is a warning that people who believe in doing the most good ought to focus their efforts where everyone can agree they are doing good. It's quite impressive, if long. It is worth it to read the whole thing.