Suppose aggregate consumer spending equals $5,000 when aggregate disposable income is zero. Furthermore, suppose that when disposable income increases from $300 to $400, consumer spending increases by $70, and that this relationship between a change in disposable income and its effect on consumer spending is predictable and constant. If aggregate disposable income equals $2,000, then which is the value of aggregate consumer spending? A) $5,140 B) $6,400 C) $7,000 D) $19,000