1. Introduction and Supply & Demand

MIT 14.01 Principles of Microeconomics, Fall 2018
Instructor: Prof. Jonathan Gruber

In this video, Prof. Gruber discusses the details of the course, what microeconomics is, and the concept of supply and demand.

License: Creative Commons BY-NC-SA

[brucedemeester]

My notes on this lecture for you guys, enjoy.

- What is Microeconomics?
- Scarcity is what drives microeconomics
- Constraint optimization exercises where economic agents (firms or individuals) try to make themselves as well off as possible given their constraints.
- It's about trade-offs. How do you make trade-off things to make you as well off as possible.
- Opportunity costs is an important concept in microeconomics
- Every action or inaction has a cost in that you could've been doing something else instead.
- If you buy a shirt, you could've bought pants
- If you stayed at home and watched TV, you could've been out working.
- Everything you do has a next best alternative you could have done instead.
- They get referred to as the dismal science
- because their whole point is that nothing is free. There's always a trade-off, there's always an opportunity cost.
- your constraint optimization means you're going to have to pass up one thing to do another.
- because of Microeconomics, you can understand the decisions that drive our economy.
- Supply and Demand model
- Models aren't 100% true, but always pretty true, "pretty" being between 10% and 95% true.
- The idea is to make a trade-off. We want to write down in our models a set of simplifying assumptions that'll allow us, with a small set of steps, to capture relatively broad phenomena.
- To capture those broad phenomena, you want to do it in the most tractable possible way.
- Positive analysis
- is the study of the way things are
- Normative analysis
- is the study of the way things should be
- Example of eBay auctions
- Auctions are a terrific example, they're like the textbook example of a competitive market. Demand comes as a bunch of people going on and bidding. People who want it more, bid more. So you get a demand curve. The higher the price, the fewer people you're getting to bid. Supply is how many units of it are for sale on eBay. You bid until those two meets. And then you have a market equilibrium at that bidding price.
- Example: someone offered their kidney for auction. The bidding went nuts. It started at $25, 000. It climbed to $5m before the auction was shut down, and eBay wouldn't allow you to sell your bodily parts on eBay.
- This raises two questions:
The Positive analysis question: Why did the price go so high?
Because the demand is high (because I'd die without it). Supply is low because not a lot of us are willing to sell their kidneys to eBay. Low supply, high demand led to a higher price.
The Normative analysis question: Should you be allowed to sell your kidneys on eBay?
The standard economics answer to start would be, of course, you should. We're in a world of thousands of people die every year because there's a waiting list for a kidney transplant. And these are people who would happily pay a lot of money to stay alive. Meanwhile, there are hundreds of millions of people walking around with two kidneys who only need one. And many of these people are poor. And lives could be changed by being paid $1m. So this is a transaction that makes both parties better off. So the standard answer would be that you should be able to sell your kidneys on eBay. The question is, why would we want to stop this transaction?
The first type of problem comes out of the category we call: Market failures. And MF are reasons why the market doesn't work in the wonderful way economists like to think it should. For this example, there could be the problem of fraud. People might not be able to tell if they're getting a legit kidney or not.
There could be an example of imperfect information. Do you know what the odds are that you can spend the rest of your life with only one kidney? We ought to know that before we start selling our kidneys.
A second problem is what we call equity or fairness, which is we would end up with a world where only rich people get kidneys.
The third problem has to do with behavioral economics., which is essentially, that people don't always make decisions in the perfectly rational, logical way we'll model them. People make mistakes.
You do the positive analysis to understand the economic framework before you start jumping to drawing conclusions. We have to be disciplined. We have to start with the fundamental economic framework.
Economics at its core is all about how the market knows best, and that basically governments only mess things up.
How freely should a market, should an economy function?
We have a capitalistic economy. And in a capitalistic economy, firms and individuals decide what to produce and consume, may be subject to some rules of the road set by the government. There are some minimum rules of the road to try to avoid fraud or misinformation, but otherwise, we let the dice roll. 
The other extreme is a command economy. In this case, the government makes all the production and consumption decisions. The government doesn't just set the rules of the road, the government owns the road. The government says we're going to produce this many cars this year. And people can get them in some way. It could be a lottery, could be waiting in line. We'll allocate how many get produced and who gets them. The government decided how many shirts, cars, TV's, everything decided how much to produce. Problems with this model:
Too many opportunities for corruption when the government controls everything.
It's hard to control human nature.
Adam Smith's invisible hand is that the capitalist economy will manage to distribute things roughly in proportion to what people want. Folks who want a certain kind of car are going to want to get to that kind of car.
Adam Smith's view (the invisible hand view) is that consumers and firms serving their own best interest will do what is best for society.
The fundamental core of the capitalistic view is that consumers and firms serving their own best interests will do what ends up being best for society.
It can lead to outcomes that aren't fair.

[mofa]

I don't know why I like these lectures, it's better than Netflix!

[M.-.D]

Great work MIT.

Open education done right.

[kamikazekami]

I normally don't write reviews but this course is so freaking amazing that I have to do it.
The course is rich in content, yet very easy to understand. Prof. Jonathan Gruber just did an awesome job and thank you guys for sharing these lectures with the rest of the world.

[MrJuanalfieri]

Impossible to get tired by listening Professor J. Gruber. He has an AMAZING way to teach Micro.
Again and again, MIT doing A GREAT JOB with the online community.

[TheTajwaar]

im an economics major student and omfg this guy makes things so fascinating. its not boring at all

[muhammadsiddiqui]

One of the best teachers in the world. Better than Netflix. Highly Recommended. I have done this complete playlist.

[enterestado]

I missed all my long and boring online micro economic classes this semester and I am now binge watching a whole semester of MIT classes. What a good decision I´ve made.

[parthasur]

I would highly recommend reading "Basic Economics: Theory and Cases" by Attiyeh, Bach, Lumsden as an introduction. Wonderful "programmed learning" type of text book - you need to focus and keep answering questions (fill in the blanks in the text) as you read the book. Answers are at the bottom of the page. There are review questions with answers at the end of each chapter followed by a case study (no answers). Calculus not required. I learnt basic Economics from this book. It is fantastic.

[h.s.]

Thank you for making this available. I appreciate that it has subtitles. I struggle with hearing and I’m anxious about upcoming classes I’m enrolled in, so I wanted to get a head start. I found some cheat sheets off of Amazon so I can focus on listening to reading the lecture rather than trying to write everything down. Awesome professor and incredible school, thank you so very much.

[Unnanymous]

Damn man you just can't deny Economics is a hell of an interesting course!

[anonymous.youtuber]

A truly great professor at 34:12 he is perfectly aware of his limitations and delegates to those that are better. 🙏🏻 Respect.

[abbysmith]

I love that I can go for a run and absorb this information at the same time. What a well-organized, clear and useful lecture!

[laxmanbafna]

"Microeconomics was born in this room".-7:10
Yup, you got my attention.

[TP-kqul]

It's free yet I feel that it is more informative and more interested than my current Economics and Finance class that we paid heavy to attend. Great works MIT and thank you so much!

[aurazero]

I'm glad Mr Gruber is still teaching this course. I'm using one of this older videos for my lessons and it was again Principles of Micro but 9 years ago. I like his style.

[screwsdisciple]

the 2010 course gave me an A in my micro economics exam and led me to give the micro economics tutorial at my university for 2 years. really excited to see the 2018 version.

[tufail]

MIT is doing a great job by providing free videos of classes. Love you for that

[alexkess]

Thank you MIT. This is a wonderful public service you offer allowing education to be more accessible.

[shelchicago]

Thank you for donating your knowledge to the world so a middle-age nobody like myself can learn something that I didn’t get to learn in my younger years.