ROI vs CAGR — the number that tells the truth
ROI is total return regardless of time. A 60% ROI sounds great until you learn it took 10 years (≈4.8% per year — worse than a CD).
Always include commissions and tax in the math. A 5% gain at the broker becomes a 3.5% gain after a 30% short-term tax hit.
Holding for more than a year qualifies for long-term capital gains in most countries — often half the tax rate of short-term. Sometimes ‘just wait two weeks’ is the highest-return decision you'll make all year.