A country has domestic investment of $200 billion. Its citizens purchase $600 of foreign assets and foreign citizens purchase $300 of its assets. What is national saving?

A marginal cost curve

A) is upward sloping. B) shows that as more of a good is produced, opportunity costs of producing another unit increase. C) is bowed inward so that its slope can become negative. D) Both answers A and B are correct.

Fixed investment includes all of the following except:

a. all purchases by businesses that add to their inventories b. all spending on capital goods. c. all spending on producer goods. d. all spending on goods that increase future production capabilities.