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A market number is an observation from a venue, not a universal truth or a forecast. These guides explain price formation, buying costs, recurring purchase plans, ETFs, and market capitalization with special attention to spread, liquidity, custody, and uncertainty.
Use the same three checks as you move through the guides. They turn a topic list into a repeatable research process.
Record the venue, pair, quote asset, timestamp, and metric definition. BTC/USD, BTC/USDT, an ETF share price, and a calculated index are related but not interchangeable. Reproduce calculations from raw observations where possible.
Spread, order-book depth, slippage, fees, taxes, custody, and counterparty exposure can matter more than a small headline price difference. Historical returns also hide the path, drawdowns, and the possibility that future conditions differ.
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