Which major actor is at the center of the foreign exchange market?

Suppose our firm produces chartered business flights with capital (planes) and labor (pilots) in fixed proportion (i.e., one pilot for each plane). The expansion path for this business will:

A) increase at a decreasing rate because we will substitute capital for labor as the business grow. B) follow the 45-degree line from the origin. C) not be defined. D) be a vertical line.

The economic argument that it is in society's best economic interest to pay for the education of "someone else's child" is the

A. moral obligation argument. B. positive marginal benefit argument. C. positive externalities argument. D. positive marginal cost argument.