Mr．Smith gave the attendants a wonder lecture      the company in the international conference.

A．on behalf'of

B．owing to

C．in the place of

D．standing for

从宏观角度考察资本主义经济周期的古典商业循环论者是( )

A．萨伊

B．杰文斯

C．庇古

D．熊彼特