It’s the one that could be living in your own basement. From the Wall Street Journal:
What do unworking men do with their free time? Sadly, not much that’s constructive. About a tenth are students trying to improve their circumstances. But the overwhelming majority are what the British call NEET: “neither employed nor in education or training.” Time-use surveys suggest they are almost entirely idle—helping out around the house less than unemployed men; caring for others less than employed women; volunteering and engaging in religious activities less than working men and women or unemployed men. For the NEETs, “socializing, relaxing and leisure” is a full-time occupation, accounting for 3,000 hours a year, much of this time in front of television or computer screens.
As the Buddha once said, read the entire thing.