Last week was a roller coaster ride for the stock market—and nervous investors. Buy? Sell? Sit tight? Panic? (The last, of course, seemed the most popular.)
On Thursday, the Federal Reserve injected $24 billion into the financial system; the very next day, it injected $38 billion. That was the Fed’s largest intervention in the economy since the days when the market reopened after 9/11.
But to everyone’s surprise, despite the Dow’s scary 387 point plunge on Thursday, the market actually closed UP for the week. Not by much, .4%, but up.

(Yale University)
To make sense of all this, we called Robert Shiller, an economist at Yale University, who wrote the best-selling "Irrational Exuberance," about the stock market boom of the 1980s and `90s. He’s more-than-capable of talking markets, models, valuation ratios, international risk sharing -— but he’s also been married for 31 years to a psychologist. We thought he'd have an interesting take on the market, and some insight into what we might expect as a new week of trading begins.
1. So what was going on last week?Markets do this. They go through sudden drops and get people rattled. Since 1950, we`ve had more than 50 such drops. It happens every year or so.
Markets all over the world have been booming. Countries are setting new records for the first time since 2000, and even depressed countries like Japan have been booming.
Now some investors are starting to wonder if it`s coming to an end. It`s very simple. Some people start saying, I`m getting out.
But because it`s coming at the end of a real estate boom, and at the end of spectacular growth in the stock market, there is the sense that something might be wrong, and that it could develop into something worse.
2. Are we seeing a replay of the 1990s' irrational exuberance, followed by the bubble`s burst?The stock market never got as exuberant in recent years as it did in the 1990s. But I would say we`ve had irrational exuberance in the real estate market...
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