Circulation of $100 bills hit an all-time high in 2018, according to a Thursday report from CNBC. The total number of bills reportedly grew about 7 percent, to a record-breaking $1.3 trillion worth. That growth is unusual: smaller bills, like $1 and $20, grew at a much smaller rate of 2.6 percent year over year. Economists have varying explanations for the discrepancy: Some believe it shows that people are trying to hoard more cash; others view it as a sign of increased criminal activity.
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