Zero-price effect (IMAGE) University of Tokyo Caption The blue dots show the reduced probability of outpatient visits per month for different payment levels relative to a zero price. If the zero-price effect did not exist, it would be expected that there would be no reduction of outpatient visits at the zero-price point. But the measured difference is considered statistically significant which therefore confirms the zero-price effect does exist. Credit ©2022 Iizuka and Shigeoka Usage Restrictions Credit ©2022 Iizuka and Shigeoka License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.