Firms often rely on external financing in order to conduct R&D. We ask to what extent discriminatory behaviour of the funds provider affects the industry evolution. The model

is based on an evolutionary framework by Nelson and Winter. A firm chooses the amount of its R&D spending in an adaptive fashion where technological improvement is essential for survival in the competitive market. Firms can finance their activities by using retained

profits or applying for credit. However, they have a clear hierarchy in choosing the source of funds and saved profits are always used up first. There is endogenous discriminatory lending as the banking sector provides credit according to firms’ individual features. It

compares profitability and market share across firms when assessing creditworthiness.

The model is able to capture features of innovation and diffusion of technology. Results show that the availability of credit is crucial for technological change in a non-linear fashion and that the industry evolves faster if the bank focuses on market share in assessing creditworthiness.