jeffrey_t_b

20 ms·

1.
by jeffrey_t_b 16d ago
It looks like his results are taken from the Federal Reserve 2022 Survey of Consumer Sentiments. https://www.federalreserve.gov/econres/scfindex.htm The data is publicly available. I don't think that this was h
2.
by jeffrey_t_b 6y ago
Well, maybe I should have said "made proposals, research projects, and demos". It takes a lot of time and money to bring an actual product to market through flight qualification, and nobody will take that on until there is suffic
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by jeffrey_t_b 6y ago
Sorry, thought that was in the story: Environmental Control System, which is the aircraft subsystem responsible for pressurizing and cooling/heating the cabin.
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by jeffrey_t_b 6y ago
I wouldn't say "designed to avoid this problem", because I'm pretty sure that cabin air quality didn't play much of a role in the engineering trades regarding ECS architecture. The 787 was intended as a more electri
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by jeffrey_t_b 8y ago
Having children has always been a choice, e.g. historical birthrates are closely coupled to harvest success. So people are choosing to have fewer children now, and most of that has to do with opportunity costs. Caplan's "Selfish
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by jeffrey_t_b 8y ago
That stuff _is_ ridiculous. I don't know if the human bladder is sized for that level of tea. On the other hand, it looks like an infographic-style addition, added by the newspaper to make the article more interesting, rather than the
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by jeffrey_t_b 8y ago
While I agree on your main point, I think that you are confusing marginal tax rate with average tax rate. E.g. the 2017 federal income tax for a single making $300k is in the "$46.6k + 33% in excess of $191k" bracket. This means
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by jeffrey_t_b 8y ago
Perhaps it meant to say that one needs a $303k/yr salary to support a $1.2M mortgage (i.e. the loan on a $1.5M house after a 20% downpayment). At an interest rate of 3.5%, that's about $5400/month. A $303k salary is maybe a
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by jeffrey_t_b 9y ago
Well, even if you say that capital expenses are irrelevant considering the very long time frame, you still have to make the argument that operating expenses of the rail are smaller. What are they, and are they smaller than air travel (~$0.
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by jeffrey_t_b 9y ago
> I guess the Airbus/Boeing duopoly is here to stay. Comac is a promising competitor, too, and are explicitly targeting the bread-and-butter size classes of Airbus/Boeing.
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by jeffrey_t_b 9y ago
It seems like Airbus paid nothing for this (maybe taking on some of the manufacturing expenses?). See: https://www.cnbc.com/2017/10/16/airbus-teams-up-with-bombard... It certainly isn't a payday for the
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by jeffrey_t_b 9y ago
A better, bigger, perspective: http://slatestarcodex.com/2017/05/11/silicon-valley-a-realit...