ドル円アノマリー追記：データが暴く「公務員の給料」も刈り取られる日 前回の記事では、「毎月25日の給料日」を起点としたシステム的な円売り・ドル買いアノマリーについて解説しました。今回はさらに解像度を上げ、「毎月1日〜31日の日付別」でドル円の平均変化率（リターン）を可視化してみました。 使用したPythonコードは以下の通りです。 ‘’’Python import yfinance as yf import matplotlib.pyplot as plt import pandas as pd import seaborn as sns # 分析期間の設定 dateStart = "2015-01-01" dateEnd   = "2026-05-23" ticker = "JPY=X"   # ドル円 df = yf.download(     ticker,     start=dateStart,     end=dateEnd,     auto_adjust=False,     progress=False ) if isinstance(df.columns, pd.MultiIndex):     close = df["Close"][ticker].dropna() else:     close = df["Close"].dropna() daily_return = close.pct_change() * 100 analysis_df = pd.DataFrame({"Return": daily_return}) analysis_df.index = pd.to_datetime(analysis_df.index) analysis_df["Day_of_Month"] = analysis_df.index.day analysis_df = analysis_df[analysis_df.index.dayofweek < 5] pivot_table = analysis_df.groupby("Day_of_Month")["Return...

Visualizing Japan's Capital Flight: The "Payday Anomaly" in USD/JPY The Japanese Yen has been experiencing historic weakness. While many attribute this solely to interest rate differentials or government interventions, I suspected a more mechanical, structural force at play: the automated capital flight by Japanese retail investors. The Hypothesis: The Payday Effect In Japan, the 25th of the month is the standard payday for most corporate workers. Recently, due to inflation and the new tax-free investment program (NISA), a massive number of people have set up automated monthly purchases of foreign equity index funds (such as the S&P 500 or All-Country World Index). I hypothesized that this creates an automatic, system-wide "Sell JPY / Buy USD" order triggered every single month around payday. The Code To verify this, I wrote a Python script using yfinance and seaborn to map the average daily return of USD/JPY by the week and day of the month, covering data...

Observational Notes on Silver Paper Investment Trusts • There are few signs that the physical silver price itself is about to decline. (Industrial demand and physical scarcity remain intact.) • However, there appear to be structural risks in the silver paper market (investment trusts, certificate-based products). • Recently: • A clearly inexperienced retail crowd has begun flowing into silver investment trust forums. • Discussions are heavily focused on price levels and price increases . • There is almost no discussion of delivery conditions, emergency clauses, or redemption terms . → This suggests a growing misconception that paper price = value . • At the same time, there are visible signs that: • More experienced participants, and • People with strong risk-management awareness are quietly taking profits and reducing positions. • This behavior appears less like a bearish view on silver itself , and more like a deliberate move to distance them...

  +AI & Rook In chess, the rook is not the most complex piece. It does not move diagonally, it does not jump, and it does not surprise. Yet in many games, the rook quietly decides the outcome. I believe +AI plays a similar role in today’s world . +AI as a Rook The rook moves in straight lines—horizontally and vertically. Its strength lies not in creativity, but in reach, consistency, and speed . +AI behaves in much the same way. It does not replace human intention or strategy. Instead, it extends them—across space and across time. In practical terms, the effective use of +AI can be summarized into two main forms: • Horizontal expansion • Vertical expansion Horizontal Expansion: Reusing Success Across Markets Horizontal expansion means applying a method that worked in one domain to another domain. In investment terms, this could mean: • Taking a strategy that worked in equities • Testing it in FX, commodities, or other markets With +AI,...