How is peer to peer more efficient than going through a bank

How is peer to peer more efficient than going through a bank?

Traditional banks incur many fixed costs associated with having brick and mortar locations, employees required to staff the locations, and less efficient processes to underwrite loans. Whereas marketplaces can make a preliminary decision online, many banks require more human review. All of these additional expenses require banks to have a much larger spread between the price they charge borrowers for credit and the rates they pay depositors.