1.   Buyers are betting that the demand for office space will only increase, because there is little new construction.

2.   Buyers are betting on a longer economic slump in which sellers will eventually have to accept lower prices, Hyland said.

3.   Futures buyers are betting they will go even higher.

4.   In purchasing an option, buyers bet that the market price of the stock will rise above the fixed price in the option, making the option itself valuable.

5.   Local buyers bet the overseas investors will pile into the stock.