Investing– category –
Independent explanations of investment mathematics, funds, valuation and technology, with transparent calculations and primary sources. Choose a starting point below.
Getting started: A practical first-month investing plan · Investing small amounts and managing fees
Understanding returns and risk: CAGR versus average returns · Leverage, margin and daily reset
Technology and market flows: AI data centers and electricity demand · Memory stock buybacks and index flows
Memory companies and AI economics: HBM, DRAM and NAND company map · Five tests for a memory supercycle · AI capex, depreciation and cash flow
Decisions when stocks disappoint: Why good earnings can send a stock lower · The break-even trap before averaging down
Check the assumptions behind each example. Product availability and tax treatment depend on your country and account.
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S&P 500 vs Nasdaq-100: Index Rules, Overlap and Downside Risk
Compare S&P 500 and Nasdaq-100 selection rules, portfolio overlap, fair return comparisons and drawdown recovery before choosing an ETF. -
How to Read a Stock-Market Heatmap Without Mistaking Color for Value
Read stock heatmaps with confidence: market-cap weighting, market breadth, P/E traps and dividend-yield definitions, with a worked example. -
ETFs vs Individual Stocks: Diversification, Costs and Position Size
Compare ETFs and individual stocks by concentration, research work, costs and portfolio impact, with an original position-size calculation. -
Inverse ETFs Explained: Daily Reset, Compounding and Hedging Risks
Why an inverse ETF can lose money even when an index recovers. Daily-reset calculations, hedge sizing and a practical exit checklist. -
Kioxia’s TOPIX Buying: Free Float, Toshiba Sales and Liquidity
Analyze Kioxia’s two-stage TOPIX free-float revision, estimate index demand, reconcile Toshiba sales and compare trading liquidity with original charts. -
Memory Stock Buybacks: SK hynix, Micron, Samsung and Index Flows
Analyze SK hynix’s 2026 buyback using KRX execution data, compare Micron and Samsung, and understand cancellation, free float, EPS and index-fund flows. -
GLD, GDX and NUGT: Gold Bullion, Mining Shares and Daily Leverage
Distinguish bullion, mining equities and daily leveraged funds, with an original operating-margin model and current benchmark information. -
VOO, SPY and IVV: S&P 500 Exposure, Fund Fees and Trading Costs
Compare VOO, SPY and IVV using issuer documents, original fee arithmetic and the trading costs that matter to overseas readers. 広告
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Stock Charts: Linear vs Log Scale, and What Neither Can Prove
Read linear and logarithmic stock charts with an original example that separates growth-rate arithmetic from valuation and forecasts. -
Retirement Withdrawals: Why the Order of Returns Changes the Result
Understand withdrawal rules and sequence risk through an original two-year calculation and dated retirement research. -
What Happens When an ETF Closes? Liquidation Dates, Cash and Investor Choices
Learn how ETF liquidation works, with a real announced timetable and the differences between selling, a merger and a cash distribution. -
Active vs Index Funds: Benchmarks, Evidence and the Cost of Fees
Compare active and index funds using dated SPIVA evidence, appropriate benchmarks and an original illustration of how fees compound.
