Leave it alone: resist the urge to check and trade frequently

Check your portfolio quarterly at most; intervene only for planned rebalancing.

Why it works

Every portfolio check is a potential decision point that activates loss-aversion: losses loom twice as large as equivalent gains in the psychological accounts, so frequent monitoring reliably generates more negative emotional signals than positive ones. Myopic loss aversion — the tendency of frequent evaluators to take less risk and earn lower returns — is one of the best-replicated findings in behavioral finance.

How to do it

1. Pick a review frequency — quarterly is a reasonable maximum — and set a calendar reminder.
2. Remove portfolio apps from your phone home screen or set them to hide balance by default.
3. Commit in writing to only rebalancing when allocation drifts beyond a pre-set threshold (e.g., 5 percentage points).

Evidence

Myopic loss aversion experiments found that investors who evaluated their portfolios less frequently took more risk and earned higher returns than those who evaluated monthly, because frequent evaluation triggered more loss-averse (conservative) reallocation. (rct)

Laboratory studies; real markets introduce additional complexity. The directional finding — less checking, better behavior — is robust across studies.

Sources

• Gneezy & Potters (1997), An experiment on risk taking and evaluation periods, Quarterly Journal of Economics
• Thaler, Tversky, Kahneman & Schwartz (1997), myopic loss aversion and the equity premium puzzle, Quarterly Journal of Economics

Common mistake

Checking daily during volatility because "I just want to know" — which converts a passive investor into an anxious one who eventually acts on the anxiety.