9 explainers
Finance and Money Systems
Practical finance explainers covering credit scores, stock markets, compounding, risk, and the money systems behind ordinary life.
The focus is clarity over prediction: how financial systems work, where incentives sit, and what beginners often misunderstand.
Tools for these guides
- Private Subscription Tracker — Track recurring payments and renewal dates, then export your list or calendar. Saved only on this device.
- Subscription Cost Calculator — Turn weekly, monthly, and annual subscriptions into one budget. Compare what you keep and cancel.
- Compound Interest Calculator — Explore how a starting balance and monthly savings could grow under your assumptions.
- Electricity Cost Calculator — Compare appliance examples or custom usage in watts, kWh, and money. Include quantities plus daily or weekly operating time.
- Solar Payback Calculator — Compare self-use and export credits, maintenance, and upfront costs before evaluating a solar quote.
- Sunk Cost Decision Tool — Compare future costs and benefits when deciding whether to continue or switch.
How to Audit Subscriptions and Calculate Annual Costs
Build a subscription list, compare monthly and annual billing, identify overlapping services, and estimate future savings before canceling.
How to Calculate Electricity Cost: Watts, kWh & Bills
Work out appliance running costs from watts, hours, and your electricity rate. See a worked example and avoid common mistakes with energy bills.
Do Solar Panels Pay for Themselves? Calculate Solar Payback
Do solar panels pay for themselves? Understand the local variables behind solar payback, including electricity rates, incentives, financing, and net metering.
How Does Compound Interest Work? Formula, Contributions, and Fees
Understand compound interest with a clear formula and examples, including monthly contributions, compounding frequency, fees, inflation, and realistic limits.
How Do Credit Scores Work? Factors, Myths, and Practical Steps
Learn how credit scoring models use report data, why you have many scores, which factors usually matter, and how to check and improve your credit safely.
How Does the Stock Market Work? Orders and Settlement
How does the stock market work? A plain-English guide to order books, market makers, trade execution, and settlement.
What Is the Sunk Cost Fallacy? Why It Is Hard to Quit
What is the sunk cost fallacy? Learn why past time, money, and effort distort decisions—and how to spot the trap.
How Container Shipping Works: Ports and Global Trade
How does container shipping work? Understand containers, ports, cranes, ships, logistics networks, and the physical system behind global trade.
Why Use Plain Text for Notes? Benefits and Limitations
Why use plain text for notes? Learn why plain files are portable, searchable, durable, and often more useful than complex productivity apps.