Historical data shows that if consumption increases by $80 billion when national income rises from $100 billion to $200 billion, then consumption will increase by less than $80 billion when national income rises from $200 billion to $300 billion

The equilibrium level of aggregate planned expenditure is found where

A) there is no saving and no dissaving. B) net exports is zero. C) aggregate planned expenditure equals real GDP. D) autonomous expenditure equals equilibrium expenditure. E) the price level is rising at a constant rate.

The Herfindahl-Hirschman index is a measure of

A) the profit margin of an industry. B) market size. C) the degree of collusion among firms in a market. D) the degree of concentration among firms in a market.