Answer: $2 billion
Step-by-step explanation:
Okun's law posits that for every percentage point that actual unemployment rate is above the natural unemployment rate, actual GDP will be lower than potential GDP by 2%.
Actual rate of unemployment here is:
= (Labor force - Employed) / Labor force
= (800,000 - 760,000) / 800,000
= 5%
Actual unemployment - Natural unemployment:
= 5 - 4
= 1%
Potential GDP lost is:
= (1% * 2) * 100 billion
= 2% * 100 billion
= $2 billion