An American who won this year's Nobel Prize for economics believes sharp rises in equity and property prices could lead to a dangerous financial bubble and may end badly, he told a German magazine.
Robert Shiller, who won the esteemed award with two other Americans for research into market prices and asset bubbles, pinpointed the U.S. stock market and Brazilian property market as areas of concern.
"I am not yet sounding the alarm. But in many countries stock exchanges are at a high level and prices have risen sharply in some property markets," Shiller told Sunday's Der Spiegel magazine. "That could end badly," he said.
"I am most worried about the boom in the U.S. stock market. Also because our economy is still weak and vulnerable," he said, describing the financial and technology sectors as overvalued.
He had also looked at "drastically" higher house prices in Rio de Janeiro and Sao Paulo in Brazil in the last five years.