The slope of the AE curve is .80. What is the expenditure multiplier?Everything else the same, by how much does equilibrium aggregate expenditure increase if

1. Exports increase from $1.75 trillion to $2.25 trillion.
2. Government expenditures on goods and services decrease from $2.0 trillion to $1.8 trillion.
3. Investment increase from $1.2 trillion to $2.3 trillion.