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September Update: Russia captured about 468 square kilometers of Ukraine and regained about 126 square kilometers in Kursk. This was Russia's biggest gain since March 2022. There are two main problems with this estimate now. First, the pace is increasing, so averaging out what has happened over almost a year is misleading. This biases toward a higher total. Second, Russia's observed equipment losses have massively spiked in the most recent couple of months. These are correlated with casualties. However, I am still using the 5000 losses/month from Putin's earlier comments. This biases toward a lower total.
August 2024 Update: The Kursk offensive is causing a bit of a headache here. Russia gained 351 square kilometers of Ukraine, but Ukraine gained 770 square kilometers of Russia. If you are only looking at the first half, then the offensive's pace is 21.8 million. If you include both, then the Kursk losses undo all of Russia's gains back until May, and the number is 68.7 million.
July 2024 Update: Russia had the second best month of its offensive, taking 0.03% of Ukrainian territory. This was much more than in June but still less than May. Still, the improved average lowered the number of remaining fatalities at the offensive's pace to 28 million and change.
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I 100% understand your sentiment. If 90% of viewers were returning, I would be inclined to do what you suggest. However, returning viewers are typically make up less than 50% of the audience. If I stopped to say "hey, watch this video if you don't understand what's going on here," one of two things would happen: (1) some viewers would do that or (2) viewers would get confused and then just click off. Either way, the YouTube algorithm won't be happy, the video won't circulate, I won't get any revenue, and I'd be better off focusing my energy elsewhere.
In sum, I agree. But that's not how this platform works, and I am at its mercy.
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What we "know" almost entirely comes from laboratory experiments in which people (normally college students) are offered money to play a game. This is a vastly different exercise from participating in a real life transaction. Yet, from these experiments, we also know that the evaluation of "fairness" rapidly becomes irrelevant as the size of the stakes increase. In other words, people are willing to inject a lot more fairness into the equation when $1 is at stake versus $100. In many ways, bargaining in the shadow of war is the largest stakes you can create.
Regardless, if you were to add some evaluation of "fairness" to the model, it remains true that the proposer offers no more than what is necessary to induce compliance. Indeed, you can account for this fairness by simply reducing the cost of war. So instead of thinking of cR as the rebel's cost of fighting, you could think of it as its cost of fighting and a valuation of fairness. In any case, G still offers x = pR - cR and R accepts.
Part (b) is only true when there is incomplete information in the interaction. Repeated interactions do not change the result with complete information. As mentioned in the lecture, incomplete information is a topic for future lectures.
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Ah, okay. The second part of my comment was addressing that point, but let me provide a clearer articulation.
Claim: For any row or column, there can only be at most one winning square.
Proof: For proof by contradiction, suppose there is more than one. Of those, consider the square furthest away from the top right corner and the next winning square within row or column. Call the first one X and the second one Y. Because the piece can move any length within a row or a column, it can go from X to Y. Because Y is a winning square, the player who landed on it wins the game. But X is also a winning square, so whoever landed on it also wins the game. However, if a player lands on X, their opponent can move it to Y. Thus, both of those players must win, a contradiction.
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Well, there are two ways to look at this:
1) When thinking about whether direct mechanisms are incentive compatible, the rules of the game are the rules of the game, period. So in the example, you get the stuff that the game master gives you, and there is nothing you can do to change that. This isn't because we are suggesting that we could replace real life interactions with the incentive compatible direct mechanism. Rather, the revelation principle gives us a way to neatly compact the otherwise (potentially) extremely complicated strategies of any given game. If this seems to only be of academic interest, you are right...so far. However, we can rewrite the revelation principle in a logically equivalent way. The next lecture does this, and we will see the absence of an incentive compatible direct mechanism means that certain outcomes are impossible to arrive at through strategic play, regardless of what the actual interaction is. This is definitely not purely of academic interest, as it says that some situations will inevitably end in war.
2) That aside, lying in that manner doesn't make sense. That would be like if strong Putin says "I am weak," and then is given a small portion of Ukraine, say Crimea. Then, the next day, he realizes he could get more through war, starts a conflict, and takes a larger portion, say Crimea and Donetsk. By lying, he doesn't get Crimea twice---he only gets it once. (That is, you can't get a war payoff and a peace payoff.) And if he was better off starting a war than taking the smaller amount of concessions, then he might as well have just told the game master the truth from the start so he could receive his war payoff.
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