Understanding ROI

Return on Investment (ROI) is the most widely used metric for evaluating the profitability of an investment. It measures the gain or loss relative to the amount invested, expressed as a percentage. ROI = ((Final Value - Initial Investment) / Initial Investment) x 100 A 25% ROI means you earned $25 for every $100 invested. A -10% ROI means you lost $10 for every $100.

Basic formula: ROI = (Net Profit / Cost of Investment) x 100 Example 1: Stock investment - Bought 100 shares at $50 = $5,000 - Sold at $65 per share = $6,500 - ROI = (6,500 - 5,000) / 5,000 x 100 = 30% Example 2: Marketing campaign - Spent $2,000 on ads - Generated $8,000 in attributable revenue (with $4,800 in COGS) - Net profit = $8,000 - $4,800 - $2,000 = $1,200 - ROI = 1,200 / 2,000 x 100 = 60%

1. Time is ignored: A 50% ROI over 10 years is very different from 50% ROI over 6 months. 2. Risk is not captured: Higher-risk investments should demand higher ROI. 3. Cash flow timing: ROI treats all returns as a lump sum. It does not account for when returns occur. 4. Inconsistent definitions: "Cost" can mean different things (total cost, incremental cost, opportunity cost). For time-adjusted comparisons, use: - Annualized ROI = ((1 + ROI)^(1/years) - 1) x 100 - Internal Rate of Return (IRR) for variable cash flows - Net Present Value (NPV) for discounted cash flow analysis

- S and P 500 (stocks): ~10% average annual return historically. - Real estate: 8-12% annual total return (rent + appreciation). - Bonds: 3-6% depending on type and duration. - Venture capital: Targets 25%+ annual returns (to compensate for high failure rate). - Marketing campaigns: 500%+ ROAS (Return on Ad Spend) is excellent; 200-300% is good. - Internal projects: Should exceed your company's cost of capital (typically 8-15%).

When comparing investments: 1. Normalize for time: Convert all ROIs to annualized figures. 2. Account for risk: A 10% ROI from government bonds is "safer" than 15% from a startup. 3. Consider opportunity cost: The baseline is what you would earn doing nothing (e.g. a savings account at 4%). 4. Include all costs: Transaction fees, taxes, time spent managing the investment. 5. Look at multiple metrics: ROI alone is not enough. Pair with NPV, IRR, and payback period for a complete picture.