Essential Mathematics for Economics

Migration to Japan works only for lower-middle-class Americans

2 minute read

Published: June 07, 2026

I often see posts about Americans moving to Japan for affordability and other reasons, such as food and culture. It is true that life in Japan is quite affordable these days, perhaps due to the weak yen and over three decades of economic stagnation. I sometimes dream about living in Japan after I retire.

住所と相続税

less than 1 minute read

Published: May 25, 2026

最近、Geminiに「引退後はどこに住んだらいいか、税制の観点から説明してほしい」みたいなことを聞いたら、目から鱗の情報を教えてくれた。

Capital One Quicksilver 0% intro APR (4)

less than 1 minute read

Published: April 20, 2026

In my post, I mentioned that I have been happy with the Capital One Quicksilver Card because it offered 0% intro APR for 15 months (and the card has no annual fee and gives 1.5% cash back on all purchases).

During the 0% APR period, I racked up nearly $30,000 of credit card debt. By doing so, my credit score went down from around 835 to 795. However, I paid off the debt last week before the end of the 0% APR period. A few days later, my credit score went back to 835. Now that the 0% APR period is over and the credit card offers only 1.5% cash back on everything (less than 2% with my Fidelity card), I contacted Capital One to switch from Quicksilver to Savor, which offers 3% cash back on dining and bakeries.

I highly recommend the card to anybody. If you open an account by clicking this link, you will receive an extra sign-up bonus.

Crowded airport lounges

1 minute read

Published: April 10, 2026

I often visit airport lounges, and a common experience is that they are crowded.