Which economist introduced the simple trade model and the concept of trade based on comparative advantage?

If Treasury deposits at the Fed are predicted to increase, the manager of the trading desk at the New York Fed bank will likely conduct ________ open market operations to ________ reserves

A) defensive; inject B) defensive; drain C) dynamic; inject D) dynamic; drain

In the kinked demand curve model, the demand curve is ________ for price increases and ________ for price decreases

A) unit elastic; relatively elastic B) relatively inelastic; relatively elastic C) relatively elastic; relatively inelastic D) perfectly elastic; perfectly inelastic