Did he say mental masturbation at the end? I'm so confused...

Thank you so much. It is always great to good feedback and recommendations. Good luck in your classes too and make sure you let me know if you have any special requests. Also... like MyBookSucks on Facebook (see the link in video description). I post new material there and also college humor.

Since KZfaq limits the number of characters, that is really hard to read! You could go to MyBookSucks facebook page and send a message (with the formula in a word document). You can see the link in the video description.

Sorry for the delayed response... This video is part of a playlist and if you go to the channel economicsfun you should see the playlist on Consumer Theory. See link in this videos description.

I cant believe im watching this 9 years later. I'm enjoying your teaching.thank you

did i just hear "mental masturbation" LMAOOOO

You are very welcome. Make sure you like MyBookSucks on FaceBook (see link in video description). This will help others find the educational videos.

Thank you for making this very clear! It was the bit at the end that was puzzling me. Thanks again!

You are very welcome! Make sure you like MyBookSucks on FaceBook (see link in video description). This will help me spread the word about the free videos.

thanks i mental came

Thank you so much for these videos ! I spent days trying to understand this topic and you taught it in a few minutes. i even told my lecturer about your videos and advised that everyone should check you out !

Thank you so much. I wish you keep your motivation and bring a lot of good teaching to life.

Great video! it was really helpful to me! thanks so much. I was sitting in class today and I did not understand what my prof was talking about.. all those indifference curves and MRS calculation. you are a life saver ! :) thanks!

Thanks again! I would encourage you to like MyBookSucks on Facebook (see the link in the description of the video). This will help other students find MyBookSucks and help ease their pain in economics. Again, thanks for the positive feedback you have given. It means a lot to me to hear from students.

Terrific job! You made things so much easier to visualize

You're the real mvp.... thank you for this

all I can say your amazing, And I got a 2.1 last year just by watching your video and barely looked at my silly lecture notes! Thank a lot.

sorry but can not find the numerical example to help please let me know where I can find it. Thank you in advance

Thank you for your comment, much appreciated.

Economicsfun you rock! Seriously very helpful, and I know others think so too

thanks for the video i have been lost in my intermediate micro class for weeks... you just cleared everything up in ten minutes wow you should come lecture at my university !!

I've added this and some others of yours to my urbanecondetroit channel as a refresher for my students.

Wait, why is MRS = dy/dx at the beginning, then MRS= -dy/dx at the end? why are they not consistent? isn't MRS the slope of the indifference curve (always negative), then at the end, if MRS = -dy/dx, it always receives positive values? So which one is that, positive or negative?

You are very welcome MrCheese! Good luck in your studies as well.

Wow ! You are the best instructor here on KZfaq ! every one else sucks ... ;)

You are so good at teaching! Thanks!

I know someone's already asked a similar question but at 7:21 when you're deriving the utility with respect to x, where does the 2nd 'dx' come from? (the part where it says (dU/dx)dx) In your reply you said that the extra dx shows that you're taking the partial derivative of U with respect to x, but isn't that already shown by the the dx that's in the denominator of dU/dx? In other words, if dU/dx is read as 'the derivative of U with respect to x', why would you then need the 2nd dx to show that you're taking the derivative with respect to x? Just confused as when doing calculus we've only ever put dx like that when we're doing integrals Hope my question makes sense + thanks for the video, it's really useful - this is only part I don't really get

Hey thank you so much for this video!! It literally saved my bacon for this semester in public finance!

I didn't see that coming, great videooo!

Great to hear the videos are helping you out. I noticed you are in Jamaica and I have never been there. Maybe I could have an impromptu economics lecture on the beach :)

i was promised a numerical example!!! great video by the way, thank you

Good question. dx and dy is notation. It reads as "I took the partial derivative of U(x,y) with respect to good x (or dx). So the dx tells you I am taking the derivate with respect to x. The function is U(x,y) and I probably should a video with an equation.

I love youuuuu, and all of your amazingly helpful videos!

Thanks a lot for explaining in simple words.

The actual utility functions are hard to write in comments since I can use exponents. If you google Cobb-Dougla Utility Function, then you will see a typical utility function.

Thank you so much for your video! It's really helpful and easy to understand. :))

THANK YOU ! You are a great person ..............

Great JOb. i wish teachers also taught this way in class.

Nicely done. Tasteful animation. How you thought about extending the analysis to include a price increase for x and then derive a demand curve for x?

@plumstreetmusic Wayne State is a great school. If you think of anything else your students need to review let me know I am always looking for ideas. I did enjoy your deriving demand from consumer budget video. And I did repost as a video response to my video (see below).

You got that right! Make sure you like MyBookSucks on FaceBook (see link in video description). We post all sorts of college humor stuff. Good luck in your classes!

Thank you so much! This helped a lot! :)

Thank you so much... you have really helped me

This is awesome. Thank you so much

Thank you so much, this was very helpful

Wow thank you so much. Great the videos are helping you in your classes too. Make sure you like MyBookSucks on FaceBook (see link in the video description). You will help me get the word out.

Great work.I really appreciat

Wow!! Outstanding 🍁💜💐

As an engineering student, I hate hate hate my intro to macro/micro economics textbook! The author is so scared to use math that he gives longwinded, roundabout explanations about everything, when he could just show some basic calculus. It'd be a heck of a lot more interesting too! :( Thank you for these vids. :D

Hello sir! Thank you for your video, i hope you will be able to answer this question since its an old video :/ its a simple and stupid question but when do i calculate MRS using the first method and when do i do it using calculus? Thank you!

sorry, where is the channel economicsfun, and also what links were you referring to in this video? I can't find any other link apart from mybooksuck, and whenever I visit this website there is nothing at all...

Thanks you sir for your explanation is so goods

Hi thanks for this useful video..I just have one question. If utility doesn't change along an indifference curve, towards the end of the video, isn't the ratio of the marginal utilities always -1, as the marginal utilities added together equals 0, one value must be the negative of the other (a+b=0, therefore a/b=-1).

Hello , Why is Delta x of a and b 20 - 30 and not 30 -20 ? Regards

I'm sorry I looked through the videos in this playlist and still cannot find the one with the numerical example. Do you remember the video title?

At 2:40 to know the MRS he calculate delta y and delta x, but why did he do (60-40) / (20-30) ? In France, to calculate the "change in" we do Final value - Start value, so (40-60) / (30-20), why did he do the inverse?

@economicsfun Thanks. You are doing a great job. I will look through your collection a make suggestions.

Did that numerical example ever end up being made? Kind of hard to process all of this using just algebra.

Thanks so much!

Great explanation of the content. What is the actual function for U? e.g. U=Sqrt(x*y) something along those lines?

Cool video. Very helpful. It’d be more helpful for some of us to have actual values in these examples. For me I have to see an actual problem worked out. You did good until you got to the end of the video in the last 3 minutes.

I don't get how we use MUx/MUy when we don't know MU (besides that they're variables)....???

If MC is constant, What does AVC look Like on a graph?

yes and may the force be with you :)

thank u for this !!

Thanks bro😊

@blake81088 Thanks and that is great to hear. My ultimate goal is this very thing.

@plumstreetmusic thanks. I take it you are teaching an advanced course in economics.

an individual's marginal utility for commodities are given by the following relation MUx= 40-5x and MUx= 20-3y. what is his marginal rate of substiturion in th3 consumption at the consumption basket X= 3, Y=5? if Px= $5 and Py= $1. Does the basket represent consumption equilibrium? Please solve this sir.

Please,,, may i know,, which types software uses,to creat such as video....like economical graph, and write, like this video..... .. Pls know me

you are the man

The best teacher ever, why can't all other moron teachers explain things like this, I'm indebted to your forever sir.

Perfect!

Thank You!!!

@economicsfun Yep. The senior/masters level Urban Economics and Real Estate Markets course at Wayne State University in Detroit

Can there be a situation where the Utility Curve is not constant? Will the equations be the same?

Thank you😊😉

Where do the dx and the dy after MUx and MUy come from? (7:20)

Thanks man

Did you do all of this in PowerPoint? If not what did you use to get these beautiful animations?

I need to be able to find MRS-xy . From a utility function

awesome

Please draw graph of utility function u = 4q - q^2

Nice

Where can I find said "numerical example"?

utility function u= 4q-q^2 how to solve this problem

how find MRS at a point?

DerivaTEEV

Thanks for your observation and I could not agree more. I believe that calculus is skipped because calculus is taught so poorly and the texts are equally bad (mybooksucks). I have experienced students do much better with the calculus explanation even if they have no prior math or calculus background.

Can anybody prove it :Prove that Marginal Rate of substitution MRSxy diminishing if U=f(x1,x2) F2^2 F11-2f1f2f12+f1^2f22

Where's the numerical example

'algerbretically' 7:57

why don't you teach how to get function.......................

I hope both sides of your pillow stays constantly cool. I love you.

He said that, weird

thnk u sir but is not visible

did he just say what I think he said

Oh, *yeah yeah*

i stopped at "mental masturbation" (by the way: i felt the same when I understood this context at uni) 😂

Mental WHAT???