If Google invests $1 billion in renewable sources of energy, the maximum increase in income in the economy can be: If Google invests $1 billion in renewable sources of energy, the maximum increase in income in the economy can be: $5 billion, if the MPC is 0.8. $10 billion, if the MPC is 0.8. $8 billion, if the MPC is 0.75. $5 billion, if the MPC is 0.5