Its main use is spotting asset-heavy businesses that earn thin returns. Banks run ROA near 1% and find that acceptable only because leverage multiplies it into a double-digit return-on-equity.
Example: Northwind Tools earns $78M on $1,480M of assets, a 5.3% ROA. Meridian Savings Bank earns $84M on $9.2B of assets, 0.9%, which is healthy for a bank.
Original diagrams for the ideas on this page. Illustrative, not real market data.
Margin and leverage. A $5,000 deposit can control a $100,000 position, which is 20:1 leverage. Because the loss is measured on the full $100,000, a 2.5% move against you halves the deposit and brings a margin call, and a 5% move uses all of it.
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