5 Lessons from the Dotcom Bubble Collapse, What Were the Overheating Signals?

30 years ago, the dotcom bubble burst.

Internet companies were valued on 'future market share' instead of revenue.

Frenzied buying pushed venture capital and retail investors into the market.

Retail investor: "The stocks I pyramided, what are they now?"

That question gets to the heart of the dotcom story.

The answer is simple, when expectations far outpace results, a bubble forms.

How did the dotcom bubble start?

Growth expectations led to cascades of investment inflows.

Technology outlooks lifted stock prices while performance verification lagged.

Tech bubble means tech stock prices attach excessively to future expectations over current results.

Why do bubbles pop so quickly?

Liquidity tightening or weak results break confidence.

Once confidence is broken, sell pressure snowballs.

Were there similar cases beyond the early 2000s?

Similar patterns appeared during the financial crisis and some new technology booms.

The core issues are "excessive leverage" and "valuation without substance."

What common mistakes do investors repeat?

Emotional chase buying, herd mentality, and mistaking short-term trading for long-term growth are common errors.

There is also a bias to remember successes and downplay failures.

How do overheating signals appear?

Surging trading volumes, sharp rises in PER or market cap to sales, and overly optimistic media coverage are signals.

When these signals appear together, caution is warranted.

So, what to remember

→ 1. Check valuation first, use growth outlooks for confirmation.

→ 2. Check leverage and cash flow, companies with high debt are vulnerable to shocks.

→ 3. Do not follow the herd blindly, good investing is not simply moving opposite to others.

This is for reference only.

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※ Figures are as of the time of writing and may change.
※ This article is for information purposes and not investment advice.