橘一良

Food Price Analytics

Energy × Inventory × Prices: A Three-Layer Structural Hypothesis

Energy prices strongly influence food prices, but inventory levels may shape price adjustment speed and volatility. A structural analysis of price asymmetry and transmission.
2026.02.21
Food Price Analytics
Food Price Analytics

How Strongly Are Oil and Food Prices Linked? Evidence from a Correlation of 0.83 and an Elasticity of 0.27

Empirical analysis of Brent crude and FAO cereal prices since 1990. Correlation 0.83, elasticity 0.27, R² 0.63. How energy prices structurally influence global food inflation.
2026.02.15
Food Price Analytics
Japanese economy

Japan’s Primary Balance Target: Fiscal Reality or a Path to Public Hardship?

Japan’s fiscal deficit often sparks alarm, but macroeconomic data show it directly supports private sector savings. Explore why the Primary Balance (PB) surplus target may harm growth and how Japan’s debt-to-GDP ratio should be understood.
2025.08.30
Japanese economy
Mathematical Theory and Calculation

What Is the Mean? From Simple Analogies Kids Can Understand to Real-World Applications

Learn what the mean (average) is in statistics: easy examples, rigorous definition with formula, Python & Excel calculation, pitfalls of outliers, and real-world applications in economics and food prices.
2025.08.24
Mathematical Theory and Calculation
Japanese economy

Japan’s Economy in 2025: Outlook, Growth, and Key Challenges

Japan’s economy in 2025 shows modest GDP growth of 1.0% but faces challenges including inflation, weak yen, and record public debt. Discover the latest Japanese economic outlook, risks, and opportunities for investors and businesses.
2025.08.24
Japanese economy
Mathematical Theory and Calculation

How to find the components and angles of a vector: visualisation in Python.

Methods for determining the components and angles of vectors are frequently used in physics and engineering.The componen...
2024.11.03
Mathematical Theory and Calculation
Statistics

Basic and advanced proportional expressions in Python

Proportional expressions are one of the fundamental concepts in high school mathematics.Proportional expressions are for...
2024.09.29
Statistics未分類
Statistics

Basics of proportional expressions and how to solve them using Python. Fundamentals

Proportional expressions are a mathematical concept that is often found in our surroundings.For example, proportional ex...
2024.09.02
Statistics未分類
Statistics

Finding solutions to equations in Python and visualising them graphically.

By graphing equations, we are trying to remember what on earth we learnt in high school maths.Graphing data is not that ...
2024.08.17
Statistics未分類
Statistics

Creating frequency distribution tables and histograms using Python.

An important part of data analysis is to be able to see what the data looks like.Common methods for this are frequency d...
2024.08.17
Statistics