Trump said he doesn't see a recession after the bond market spooked investors and the Dow suffered its worst day of the year last week.Marketsread more
Americans now say they approve of free trade by 64%-27%, a margin of better than two to one. That's up from 57%-37% early in Trump's presidency, and 51%-41% near the end of...Politicsread more
Stocks in Asia edged up Monday morning as U.S. Treasury yields bounced higher after plunging last week which sent markets into a panic.Asia Marketsread more
The problem with tanking equities lies elsewhere, writes Michael Ivanovitch, because traders see no end to America's unfolding trade disputes with Europe and China.World Economyread more
Beijing wants to use reforms to support a slowing economy.China Marketsread more
Trump said Cook made a "good case" that it would be difficult for Apple to pay tariffs, when Samsung does not face the same hurdle because much of its manufacturing is in...Technologyread more
The yield on the benchmark 10-year Treasury note briefly fell below the 2-year rate on Wednesday, a phenomenon in the bond market known as yield curve inversion, which is...Marketsread more
Despite aggressive strides, Waymo needs one thing before their self-driving cars become a seriously useful transportation system: people. We talked to the ones closest to it.Technologyread more
The hearing will now begin next Monday to allow time for the completion of a previous trial that revolves around former 1MDB unit SRC International, a Kuala Lumpur High Court...Asia Newsread more
"I don't want to do business at all because it is a national security threat," Trump told reporters.Technologyread more
Trump's is due to visit Copenhagen early next month, when the Arctic will be on the agenda in meetings.Europe Politicsread more
"My price-earnings ratio has been above 20 for more of the last 20 years," he said. "It's at 26 now. So, it's a little higher than the average for those years, but it's been high for a long time. It's not exactly a new alarm."
Read MoreThe most expensive apartment?
On CNBC's "Halftime Report, " the Yale University economics professor said that the cyclically adjusted price-to-earnings ratio appeared to be reaching its upper limit when it came to stocks.
Shiller, who developed the CAPE ratio along with colleague John Campbell, said that the measure, which looks at P/E ratios averaged over the preceding 10 years, showed that stock prices have been relatively high over the past two decades.
But those valuations could soon take a hit, he added.
"There's instability in the world economy," he said. "The Fed is tapering."
Bonds, too, were in a similar boat, Shiller said, citing Treasury Inflation-Protected Securities.
"We've had negative TIP rates recently, so what's going on here? How can it be that 30-year TIPS were negative in 2012? How can it be that people think that we can get a return, a riskless return in real terms for 30 years? There's something bizarre," he said. "That looks a little like a bubble, as well. So, the whole thing might correct down, both bonds and stocks."
As if overvaluations in bonds and stocks weren't enough, Shiller also said that housing could be getting lofty.
"I've been kind of surprised by the housing market. It bottomed out in 2012. It's up something like 25 percent, in some cities much more than that," he said. "So, we are seeing a sort of boom in the housing market.
"So, you know, we've got stocks and bonds highly priced, and now we're starting to see housing maybe going in the same direction. It's like everything, everything is pricey."
The reason, Shiller added, could be a counterintuitive one.
"It might seem perverse, but worries about the future can actually cause asset markets to be priced highly," he said. "I called it the life-preservers-on-the-Titanic theory. When the Titanic was going down, people would pay a fortune for anything that floats. … I'm exaggerating, of course, but that might be the situation we're in now."
—By CNBC's Bruno J. Navarro.