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Why I give my students a ‘tragedy of the commons’ extra credit challenge

washingtonpost.com

71–80 of 90 posts

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#71
So you get all the grades from your fellow students and organise the bottom 9% to choose 6 and the rest of the class chooses 2

in 6 months 4 points on a random test will be completely forgot.. might as well game the professor that is trying to game you

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#73

The professor omitted the sole interesting number: what percentage of students choose 6 points. Is it typically 15% or is it typically 80%? It makes a huge difference. Most likely, it's a percentage low enough to indicate that the 10% threshold is carefully chosen. Otherwise he'd tell us. This is evidence that he has an agenda to promote (that people are too selfish), and that the facts don't support his agenda (most…

He mentioned here: https://twitter.com/SelterMosby/status/619250594071638016 that for that particular group it was 20%.

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#75
post #59
post #48

Earlier quoted context omitted.

From the article, the class isn't graded on a curve so your assumption that 2 points is worthless doesn't apply.

This assumes you haven't already maxed out the GPA value for the course. If you already have a 92 (I went to a school that didn't have "A+", YMMV), there's no reason to increase your grades, and anyone else increasing their grade has the potential to devalue yours. Note that this is fixed by just averaging your actual grades out of 100 to form your GPA, instead of mapping from a 0-100 range to an enumeration to a 0-4…

Since this is for extra credit on a term paper that hasn't been graded yet, isn't it a little early to know (for sure) that you maxed your grade?

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#76

I'm surprised no rich student ever just offered ahead of the tally that they'd pay everyone $x if no one choose 6, where x is more valuable than 4 points. He now has the ability to safely choose 6, and everyone else is paid for their cooperation.

Well, rich students don't need good grades since they'll just live off their trust fund, I suppose? (or get a job at daddy's hedge fund)

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#77
post #38

Earlier quoted context omitted.

> "points" have no intrinsic value except in comparison to your classmates this would be true if the course was graded on a curve, but the article makes clear that > the course grades are not curved.

Doesn't matter if there's a curve. Your grades are still only meaningful compared to your classmates. (ok, assuming you're not in danger of actually failing the class)

No they're not. They have nothing to do with your classmates. It's not a competition.

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#78

> I’ve been giving it to students since 2008, and only one class has successfully mastered the challenge. That's a real surprise. The 2 points option is the safe one, so everyone should go with that. Sure, I could assume that all (or most) of the other students think so and just get the 6 points myself. But then again, chances are that the other students think the same. So let's just go with the safer 2 points.

No, the safe option is to get organized and plan out who is going to chose the 6 points. That way, you know if you secretly chose the 6 points when you were supposed to get 2, you will get nothing. Then it doesn't become tragedy of commons, but rather an experiment with vandalism. The experiment, IMO, isn't valid. In RL tragedy of commons, the selfish don't really suffer that much .. it's usually everyone else that d…

"No, the safe option is to get organized and plan out who is going to chose the 6 points."

If you think that's a safe option, you've clearly never dealt with large groups.

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#79
post #75
post #59

Earlier quoted context omitted.

This assumes you haven't already maxed out the GPA value for the course. If you already have a 92 (I went to a school that didn't have "A+", YMMV), there's no reason to increase your grades, and anyone else increasing their grade has the potential to devalue yours. Note that this is fixed by just averaging your actual grades out of 100 to form your GPA, instead of mapping from a 0-100 range to an enumeration to a 0-4…

Since this is for extra credit on a term paper that hasn't been graded yet, isn't it a little early to know (for sure) that you maxed your grade?

Depends on the relative value to the rest of the course, I suppose. If you've been acing every test and homework you can be relatively confident you'll do well - at least, this was my experience in college. I didn't have many classes that had grades entirely based on one assignment though.

Re: Why I give my students a ‘tragedy of the commons’ extra credit challenge

#80
post #61

Earlier quoted context omitted.

Great, except votes are anonymous.

It doesn't matter because the requirement is NO ONE choose it. There is nothing to gain by selecting 6. The second you are writing 6 down on your paper, you better hope the 4 extra points are worth more to you than $x because you have absolutely invalidated the game, not "maybe" invalidated it. If x is big enough to trivialize 4 points, I am pretty sure no one would choose it (or at least fell well below 10%). For ex…

Have I? Assuming that it's a large enough class to where there are at least a handful of slots for 6s, and the one rich kid is offering the money so they get the 6, I might choose 6 as well, betting that few enough people will decide to risk it.
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