Is It 1996 or 2000?
The Shiller PE has climbed to 39.8, the second highest on record. Media calls it mania. But the real question is not whether it is a bubble, but whether we are closer to 1996 or to 2000. The economy, inflation, and the rate-hike lag point to an answer.
Key Takeaways
- $80B of retail money flowed into US equities over two months (a decade high). The S&P 500 is near record highs, up nearly 20% since March. The Shiller PE at 39.8 is second only to December 1999's all-time 44.2.
- The real question is not whether it's a bubble but whether this is 1996 or 2000. After Greenspan's 'irrational exuberance' warning in 1996, the S&P still rose another 130%.
- Test 1, the economy is still strong. Real GDP 2.7% (4% Q2 estimate), 120K+ monthly job creation. No recession signal.
- Test 2, inflation is the swing factor. It rose from 2.4% to 3.8% in 2026, drifting from the Fed's 2% target. The same pattern as the late 1990s.
- Key point: rate hikes work with a 12-14 month lag. After the January 1999 hike, job creation only weakened from March 2000, and the S&P rose another 25% in between. So this looks closer to 1996 than 2000.
Over the past two months, $80 billion of retail money has flowed into US equities. A decade high, more than double the monthly average of 2024 and 2025.
The S&P 500 is near record highs, up nearly 20% since March. At the same time, the Shiller PE has reached 39.8, the second highest on record.
What Is the Shiller PE?
It divides the stock price by the average earnings of the past 10 years. Averaging a decade smooths out single-year swings, so it gauges whether the market is expensive over the long run. It was created by Nobel laureate Robert Shiller. A higher number means a more expensive market.
Shiller PE — Historical Peaks Compared
Historical average is about 32x. Today's 39.8 is above 1929 and close to the 2000 record of 44.2. Source: GuruFocus, multpl.
The historical average is around 32, and we're near 40 now. We've already passed 1929's pre-crash level (about 32) and are closing in on the December 1999 record of 44.2.
Media calls this 'mania,' with headlines comparing today to 1999 and 2007.
But here's the thing: those headlines are not new.
That Bubble Warning Was Already Out in July 2025
The same bubble warning was out in July 2025. Yet the S&P 500 rose another 25% after that.
Go back further: in 1996, magazine covers were already calling it 'the hottest market ever.' Fed Chair Greenspan himself warned of 'irrational exuberance.' The market had already risen 130% over five years.
And after that warning, the S&P 500 rose another 130% through March 2000, before finally dropping 50% in the dot-com bust.
The market can stay irrational longer than you can stay solvent. The same applies today.
So the real question is not whether it's a bubble, but whether we're closer to 1996 or to 2000. And that we can answer fairly precisely.
Test 1. The Economy Is Still Strong
US real GDP growth is around 2.7% now. That's despite the Middle East war, and the Fed sees it potentially rising to 4% in Q2. The same conditions as the 1990s bull market.
Over the last 40 years, whenever growth was at today's level, the market was in a bull run. Stocks only fell when growth rolled over or tipped into recession.
The key gauge is jobs, and the US is still adding over 120,000 jobs a month. Cooler than the 2021 peak, but not a recession signal.
Consumer spending is 70% of the US economy, so more jobs means more spending, which lifts the economy. Every past recession came after job creation turned negative. That's not where we are now.
Test 2. Inflation Is the Swing Factor
US Inflation — Reaccelerating
Up from 2.4% to 3.8%. In the late 1990s, inflation rising from 1.5% to 3.7% pushed the Fed to hike. Source: US CPI.
This is the real risk.
US inflation rose from 2.4% to 3.8% in 2026, drifting away from the Fed's 2% target.
Why it matters: the late 1990s looked exactly like this.
Back then the Fed cut rates slowly while inflation fell, which lifted stocks. But when inflation climbed from 1.5% to 3.7%, the Fed reversed and started hiking. That was the beginning of the end.
We're in a similar spot now.
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But It Won't Pop Right Away
Dot-Com Case: The S&P Rose 14 More Months After the Hike
The Fed hiked in January 1999, but jobs only weakened 14 months later. The S&P rose 25% in between. Source: Federal Reserve, S&P data.
Here's the most important point.
Rate hikes work with a lag. Usually 12 to 14 months.
Take the late 1990s. The Fed hiked in January 1999, but jobs only started rolling over in March 2000. A full 14 months later.
And in those 14 months, the S&P 500 rose another 25%.
The reason is simple. It takes time for higher borrowing costs to filter through the economy before firms actually cut staff. A hike doesn't make companies fire people the next day.
So even if the Fed hikes in the second half of 2026, the real hit would likely land around the second half of 2027.
So Where Are We
Putting the three together:
1. The economy is strong no recession signal
2. Inflation is the risk 2.4% to 3.8%, which could force a Fed hike
3. But even a hike hits a year later stocks can rise in between
The conclusion is clear. This looks closer to 1996 than 2000. Not the end of the bubble, but somewhere in its later innings.
Of course it won't be a straight line up. Even before the 2000 peak there were several 10%+ corrections. Selloffs like the June 5 chip drop will keep happening.
But in the big picture, the trend is still up.
Three Things for Investors
1. 'Looks like a bubble' is not 'sell now' Valuations are expensive, yes. But expensive markets getting more expensive has historically lasted a long time. After the 1996 warning, the market rose another 130%. 2. Watch inflation and the Fed If inflation cools → less Fed pressure → bull market extends. If it rises → Fed hike → the countdown starts. But that countdown is still about a year long. 3. Dips can be buying opportunities As long as the trend holds, selloffs like June 5 are likely dips within the trend. But check each time whether inflation and jobs are breaking that trend.
In One Sentence
Valuations have passed 1929 and neared 2000, but the economy is still strong and even a Fed hike would only bite a year later. This looks closer to the bull's later innings (1996) than its end (2000), with inflation the swing factor.
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References
- [1]GuruFocus / multpl. S&P 500 Shiller CAPE Ratio 39.8 (Jun 2026), all-time high 44.2 (Dec 1999). GuruFocus, multpl.com, 2026-06.
- [2]Federal Reserve. Real GDP ~2.7% (Q2 est. up to 4%), inflation 2.4% to 3.8% in 2026. Federal Reserve / BEA / BLS, 2026.
- [3]US BLS. Monthly job creation 120K+, no recession signal. Bureau of Labor Statistics, 2026-06.
- [4]역사 사례. Greenspan 'irrational exuberance' (Dec 1996), S&P +130% to Mar 2000. Federal Reserve archives, 1996-2000.
- [5]역사 사례. Fed hiked Jan 1999, job creation rolled over Mar 2000 (14-month lag), S&P +25% in between. Federal Reserve / S&P, 1999-2000.
- [6]Investment flows. $80B retail inflow over two months, a decade high. Market data, 2026-06.