Market Foundation: The Mechanics of Supply, Demand, and Spreads

This educational guide explores the fundamental mechanics of financial markets, primarily focusing on how imbalances between buyers and sellers dictate price movements. It details the four core drivers of market demand—news, fundamentals, sentiment, and macroeconomics—and explains their varying impact across different trading timeframes. Central to the text is the order book, which serves as the physical manifestation of supply and demand through bids and asks. The source emphasizes that the bid-ask spread represents a significant hidden cost that can erode profitability if not managed carefully. Additionally, it highlights how liquidity and volume fluctuate throughout the trading day, directly affecting transaction costs like slippage. Ultimately, the material provides a framework for evaluating trade viability by weighing potential gains against the realities of market execution.