Grades are made up of:
40% best midterm
60% final
Professor Hahn is actually quite a clear lecturer - yes, they are dry, but he gets the main ideas across. He also provides class notes online, which is pretty helpful if you skipped a class or two. His class is also very straightforward, his tests are purely math problems without any kind of tricky wording or long intro. However, he does not provide any type of practice problems for the tests, and his homework problems are not really similar to the test questions. This has definitely made it very hard to study for his tests.

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I think Professor Hahn gets a bad rap and the reviews make the class seem really scary, but I was pleasantly surprised by this class. Although econ 41 is demanding in material, Hahn is an engaging professor, very clear about the material, and easy to understand. He posts the entirety of lecture notes online as a PDF, including homework problem solutions. It is pretty easy to follow along what he is doing in class.

If you want to get a good grade, stay on top of your work. Go to class, pay attention, and do the homework within a couple days of learning it. TA sections are also really helpful for actually applying what you learned. To study for the tests I made flash cards of all of the concepts and then did the homeworks and TA notes a couple times. The tests don't use word problems and are very conceptual, so understanding formulas and being able to manipulate them will get you far.

My year was a bit screwed up because the final was online, but the grades are usually 40% whichever midterm you do better on and 60% the final. Then, he uses a class rank to curve it. Study hard for both midterms, even though the first one is significantly easier. This will better prepare you for the final, which was pretty difficult even online.

Despite the material being hard and the tests also being hard, Hahn was a good professor and I don't think he deserves bad reviews. Initially I wanted Rojas, but I think the classes are probably equally as hard. Overall, if you're taking Econ 41 with Hahn, don't expect it to be easy. But if you give it attention and practice, it's not that hard to do fine!

Do not ignore the other reviews - Professor Hahn is all bad. His lectures are OK and he obviously knows his stuff, but its almost as if he structures the class hoping you will do poorly. The entire grade is based off your highest midterm and the final, both of which are extremely difficult and far too long for the amount of time you are given. The only materials he provides and recommends are select HW problems from the textbook, yet he literally says in his syllabus that only 30% of the test questions will be based on HW questions - and I would say that is a high estimate. The questions are entirely different from the HW and way, way harder, often taking the material to difficulties far beyond the scope of the class. Furthermore, the class is on a pure curve that ensures that about 20% of the students will receive a "C-" or lower (not good enough for bus econ). On top of all that, he is very dry and not a very nice guy. You are better off waiting a quarter for a different professor.

The only reason I scraped a B+ in the class was because classes were canceled week 10.
Everything up to and including the first midterm was easy and straightforward, and then you get plunged into some strange dimension where nothing makes sense and math hates you or something. Unfortunately, this class is a pre-major requirement, so you can't not take it, but at the very least don't take this class with this professor, or at least not at 8:00 in the goddamn morning like some idiot (me).

Study as much as you can (the textbook is awful, and the professor lists off a bunch of questions he recommends you don't do and only a couple that you should so that's difficult) and attend TA section every week for some actual learning. Ryan Boone is a legend, take him if possible.

He gives you all the notes at the beginning of the quarter and lectures off of those. All tests are multiple choice but he loves using "none of the above" and not giving you enough time. You have to buy the Econ calculator. I couldn't find a pdf of the textbook online so I had to buy it. Good luck.

Overall, he is not a bad professor. I read a lot of bad review on his review. I don't know why, he is a nice guy. Even his exam is really time limited, but everyone does. You don't lose any advantage. He will post lecture almost a week ahead, which is really organized for student to learn new materials. As I said, his exam was tough, because he didn't allow use calculator. If you're good at math, this is a nice class for you; if not, you need consider take this class or not. BTW, His HW is the key to success in the exam.

If you are ever planning on taking this class with this guy, prepare to live through hell for 11 weeks of your life. He is THE WORST PROFESSOR EVER PERIOD. Don't be like me and listen to the numerous horrible reviews this guy has. He single-handedly fucked up my entire GPA so be ready for that. I hated taking this class with him. You will too. His lecture notes are incredibly messy and he honestly, genuinely does not give a fuck about his students. If you still want to take his class after reading this, be sure that I'm praying for u.

I'm here with an honest review of Professor Hahn. Just had him for Fall 2020. I got a C.

All of these salty comments are from people who do not understand how elite our school is. My classmates and I faced a grade of the following scale: [HW x 0.05] + [MIDTERM x .35] + [FINAL x .6]. Really hard odds. Examinations are very thorough and you have little time to complete it. He gives you so much material. It's extremely math/stats intensive.

All of this being said, Professor Hahn is actually a really good professor. I find other reviews on him calling him "sleepy" and "un-engaging" and "hard to understand" to be short-sighted slaps to the face from ignorant people. Yes, he has an Asian accent, but his language is still comprehendible. Yes, his lectures sound cumbersome, but what is he supposed to do when teaching such difficult math at the UCLA level? Is he supposed to be jumping out of his chair in excitement every sentence?

To all the people complaining about the way he talks, the legibility of his notes, the unfair grading scale, the TAs, GROW UP. The professor was fine. In fact, he was extremely nice. You're complaining because you don't want to put in the extra effort of studying, attending live lectures, going to office hours and emailing him extra questions. Stop bagging someone just because you didn't want to put in the work. I gave it 100% and only got a C. It's tough. The Economics pre-majors are tough. But if you can't get a passing grade, it's not the professor's fault. It's yours. Classes like this are extremely tough and it's your choice to take this major.

As indicated by other reviews, Professor Hahn isn't the best professor and often explains things in a far more complicated way than needed (and his messy lecture notes that are almost impossible to read and understand without rewatching the lecture), making this class difficult. That being said, however, he does get the job done and it is still possible to do good in this class. The class was fair and ultimately you get what you put into it. Also, the curve can really help you (top 25% get A/A-, 25%-65% get Bs).

Lectures: His lectures consisted of brief introductions to formulas and then some examples/going over the problem set questions. It was easy to follow along and he explained things well, but not concisely or in the most direct way. There was not much explanation of why/how to use the concepts, just on memorization for the test.

Problem Sets: There were a total of 15 homework assignments that consisted of 7-10 questions and were graded for completion. They weren't too difficult (especially later in the quarter) and both Hahn and the TAs went over them so you know if you're doing them right/wrong. The questions did closely match those on the exams so use these to study.

Exams: Class consisted of one midterm (35% of grade) and one final (60% of grade). The questions were fair and close to the HW questions (with a little bit added difficulty), but there is a BIG TIME CRUNCH on both exams so it can get tricky. Many students couldn't finish Open note due to online but we had to use the responds calculator which added unnecessary stress. Class medians were 62% for midterm, 71% for final.

Clarity: Hahn isn't the most clear and approaches statistical topics from a calculus perspective (so it is different from other stats classes you may have had). His lecture notes are messy but watching the lectures fully will help clear things up. He was good with communication and sending out reminders.

Helpfulness: Besides from the Problem Sets, no other resources were given so you are on your own. He did host live Q&A portions during scheduled class time and they were recorded, but you will have to fend for yourself.

TLDR: This class is made more difficult by Hahn, but its not impossible. Focus on the exams and really understand how the HW questions work and you should do fine.

Professor Hahn is actually not as bad as the reviews say, you can definitely get an A if you put the work in. Econ 41 is not easy and his approach using math actually simplifies it. One thing you need to know is Hahn loves to connect all the materials and put them all into one question, that's why the exam questions are hard. Also you need a strong calculus foundation to be able to work on the exams. Despite all that, his lectures are pretty clear and logical to me, even if you have hard time you can always go to his lecture time or office hours and he will help you out. He even points out what chapters are harder and how you can prepare for them. He also gives practice exam questions to the TAs so having a nice TA is important because some will explain and give more practice exam questions than others (my TA was completely useless so I jumped section which helps). Overall, don't expected easy A from these classes but if you know how A is totally doable.