GDP Gap
  
Hi ho, hi ho, it's off to work, work, work’in on...getting jobs.
That’s what the people of countries with large GDP gaps are saying.
The GDP gap is the output a country would’ve made...if they only had more jobs for people who are job-hunting.
GDP is a widely cited economic indicator and measurement of productivity. The GDP measures the total market value of all goods and service produced within a country during a specified period (like a year, or whatever). In comparison, the Gross National Product (GNP) measures the total market values of all goods and services produced by a nation’s citizens, regardless of where they live.
So basically...the GDP gap is the money lost nationwide from the shortage of supply of jobs. Of course it’s GDP gap and not GNP gap, since GNP includes money Americans are making while they live and work abroad in China (and other places).