Market Crises
Investment Memory: What Market Crises Should Leave Behind
From the TMT bubble to subprime stress, market crises are useful only if they become process memory rather than anecdotes.
Market crises are often remembered through dates and labels: TMT, subprime, liquidity shock, banking stress. That memory is useful only if it changes the way portfolios are built and reviewed.
The TMT episode showed how a convincing long-term story can become dangerous when valuation discipline disappears. Innovation can be real while prices become excessive. A good investment process must be able to hold both ideas at the same time.
The subprime crisis showed that risk can migrate away from the place where investors think they are measuring it. Leverage, liquidity assumptions, structured products and correlation can connect portfolios that appear diversified in ordinary conditions.
The lesson is not to fight the last war. It is to build a memory of mechanisms: crowding, leverage, forced selling, valuation excess, model dependency and the speed with which liquidity can evaporate.
That memory should appear in practical tools. Scenario analysis should include liquidity pressure. Position sizing should account for the possibility of being wrong for longer than expected. Portfolio reviews should ask whether diversification is real or only cosmetic.
A crisis has professional value when it improves the next decision. The point is not to become permanently pessimistic. It is to remember that markets are human systems, and that process is the investor's best defense against forgetting.