The emergence of these modern forms has not been without controversy. Critics accurately point out that none of these new players have experienced a complete credit cycle and thus, their underwriting models have not been market tested by an economic contraction. What's more, some of these new models rely on a market place lending format. It's unclear if this source of capital will be stable over time, as other companies, most notably, Lending Club, had a difficult time attracting investors in early 2016, even though net returns seem higher on invoice finance platforms such as MarketInvoice and FundThrough than on business loan platforms such as Funding Circle.