What percentage of tenants are good

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With the recent article claiming 62% of Americans have less than $1000 in savings, how viable is a business that relies on people to pay monthly rents. If for the sake of this question we divide prospective tenants into three categories, 1 nightmares, people who cost more money than they pay 2 mediocre, or 3 good, defined as people who pay on time and do less damage than their security deposit. What percentage do you say fall into each category, and with good screening techniques how much can you change this.