Analysts say the institution owns more than $1 billion in privately placed securities, which are considered extremely risky because they do not trade easily.

There, they could easily trade among themselves as well as serve the retailers doing one-stop shopping along the center's hallways.

In today's market, air rights might easily trade for $50 a square foot, suggesting an amount in the neighborhood of $10 million or higher.

Such assets experience a high level of trading activity, meaning they trade easily, several times a day.

To get one they can easily trade food.

And, for a change, you can't easily trade them.

The major Canadian stock exchange is in Toronto, and Americans can trade there easily.

"I'll easily trade no rate of return in the near term for higher confidence that a stock will outperform in the long term," he said.

"As soon as the market gets a whiff of a recession occurring," he said, "it'll easily trade 15 percent lower than current levels."

One of the main reasons why the Romans built so many roads was for them to be able to trade easily with other countries.