The go-go days of marketplace lending have screeched to a halt in recent weeks, as anxiety spreads among the big-money investors who fueled the sector's rapid growth.

The worries are being fanned by an uptick in delinquent loans at some of the leading online platforms, which has contributed to a decline in the returns enjoyed by loan purchasers, as well as by mounting doubts about the industry's short track record and diminishing confidence in the U.S. economic outlook.

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