Nowadays, most of the empirical studies and models concern average properties like expected returns, volatility, or correlations, and little attention has been given to the extreme movements.

目前，很多有关金融风险的研究都是针对均值、方差、相关性，很少有人关注极端的波动情况。

youdao

That's a far cry from the 6.5% AvalonBay earns on average from the properties it builds.

FORBES: Magazine Article

Since the height of the market five years ago the average price of terraced properties has fallen by 27%, with flats down 23%.

BBC: Detached house values 'up ?100,000' over past decade

Average percentage yields from rented properties are still in the high single digits, so demand persists.

ECONOMIST: Is Dubai being hit by the turmoil?