Priciples of Microeconomics (2) Today we're going to start talking about what's underneath the demand curve . So basically, what we did last time, and what you did in section on Friday is talk about sort of the workhorse model of economics , which is supply and demand model. And we always start the class with that, because that's the model in the course. But I think as any good sort of scientists and inquisitive minds, you're probably immediately asking, well, Where do these supply and demand curves come from? They don't just come out of thin air. How do we think about them? Where do they come from? And that's what we'll spend basically the first 1/2 of the course going through. And so we're going to start today with the demand curve, and the demand curve is going to come from how consumers make choices , OK? And that will help us drive the demand curve. Hari ini kita akan mulai berbicara tentang apa yang ada mendasari kurva permintaan. Pada d