This paper studies asymmetric information on banks, relationship lending and switching costs. According to classic theory of relationship banking asymmetric information on borrower types causes an informational lock-in by borrowers: good borrowers are tied to their banks. This paper shows that an informational lock-in effect occurs even if borrowers are identical. Asymmetric information on banks generates an informational lock-in for borrowers. A borrower is tied to the initial bank even if it charges higher loan interest. The borrower is not ready to leave the bank and take a risk that the new bank proves to be even worse.