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It's all about small, keeping it smaller  than you think it is. So it's not about  going to the gym for an hour every day  when you're stressed, forget it... Your  amygdala and prefrontal cortex will be  duking it out for that one. No way you're  not going to go. It's like you're waiting  through molasses to put your sneakers on.  But if you start small and say I'm going  to go for a five minute walk today  you'll do it. Ini semua tentang hal yang simple, menjaganya tetap lebih simple dari yang kau kira. Jadi ini bukan soal pergi ke gym selama satu jam setiap hari saat kau stres, lupakan saja... Amigdala dan Prefrontal Korteksmu akan menghalangimu untuk melakukan hal itu. Tak mungkin... kamu tak akan pergi. Ini seperti kau sedang menunggu sirup pengganti gula atau mulai “ngemil” dengan makanan ringanmu. Tetapi jika kau memulai dari hal kecil dan mengatakan aku akan berjalan kaki lima menit hari ini, kau akan melakukannya. But sometimes ...

So let's say this mathematically.  At a point like A, point A, OK, you  have your marginal utility for pizza is the derivative of the utility function with respect  to the number of slices of pizza. It's the marginal utility. It's derivative of the utility function. So it's dU dp, which is equal to 0.5 times C over square root  of P times C, OK? And, at point A, at point A, we had  two cookies and five pizzas. At point A, P was five. C was two. OK, that's true of point A.  So we can evaluate the marginal utility dU dp, which equals 0.5 times C over square root of P times C.  So that's 1 over the square root of 10.  That's the marginal utility of the next slice of pizza. The next slice of pizza makes you 1 over square root of 10 happy.  Once again, that number is meaningless. So we only care about it in ratios. So we need the ratio. So let's do the marginal utility of cookies.  That's dU dC, which is 0.5 times P  over square root of ...

  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 mendasari kurva permintaan...