25. Adding Demand and Supply Curves Horizontally 

Hi Tony, I was hopeless for my upcoming economics midterm... but thank God I found you on RU-vid and spread the word to all my stuck fellows … we all owe you big time! Great job… you are and excellent teacher! Diana

@masrurkhan If quantity demanded is different, add the demand curves horizontally at each price. For example, if Q1 = 10 - P and Q2 = 20 - 2P, the aggregate quantity for a non-public good is Q = Q1+Q2 = 30-3P. If it is a public good, it is nonrival (different consumers can consume the same unit of the good). In this case, add vertically (add demand curves in "P=" form) because you want total willingness to pay for a unit. This is worth its own video. When I have time, I'll do this.

Great video! Helped me understand this stuff so much easier than my prof was teaching it

you know this 8 minute lecture was so much better than my 2 hour lecture in which i learnt nothing. thanks

Thanks! This helped me figure out my homework problem!!! You're the best!

If there are 2 supply equations,for example-Qs1=100+4p,Qs2=50+3p,How can I add the 2 supply curves ? will the market supply curve be kinked ?

@masrurkhan Thanks for the comment. Unfortunately, I don't have a set of examples on externalities / public econ aside from what is in my book. All I have is whatever exercises there are in the book plus whatever I have posted on RU-vid. As far as other resources, you may want to check out my video website (link in the description of this video). I hope that can be helpful.

it was really really helpful. thank you many many times. God bless you!

how do I sum this two supplies? P=3q & P=66 , how do I sum horizontally

Hi, thanks for the video, Did you notice that 80/13=6.15 which is less than 10 ?

thanks man!! brilliant explanation

How did you arrive at 13?

@dianabsierra Thanks! Much appreciated.

What if our MC=10

80/13 is less than 10, therefore, it should be lower than point 10. but regardless of that. I got the point. thanks.

Thanks Seth Rogan!

you skipped over the most complicated parts! you should go step by step

I fucking heart the poop out of you.