And we collude. We design tests, or at least in Britain, so that people pass them. Right?

The absence of a world government deters abusive power however imperfectly, it forces governments to compete (even though they often collude). And, in an imperfect world, part of each government s job is to protect its citizens from enemies.

But every behavioral divergence between two sided and traditional markets can be understood using simple tools of elementary microeconomics, such as the distinction between substitute and complementary products. When producers of substitutes collude, they usually raise prices producers of complements, by contrast, collaborate to lower them.

Erdoğan s ambition to restore Turkey s primacy in the Sunni world is driving him to collude with this challenge to the Western devised regional order. Indeed, Turkey has been offering logistical support to the Islamic State, even as it has enabled the group s murderous members to massacre thousands of civilian Kurds and Yazidis in the Syrian town of Kobani on Turkey s doorstep.

OK? We collude, and actually if you if someone had designed a test for me when I was doing my biology exams, to really understand, to see whether I'd understood more than just kind of putting starch and iodine together and seeing it go blue, and really understood that plants took their mass out of the air, then I might have done better at science.