Negative feedback occurs when the rate of the process decreases as the concentration of the product increases. positive feedback occurs when the rate of a process increases as the concentration of the product increases. which type of feedback is the diagram illustrating? a) negative feedback which causes the rate of the process to decrease as the concentration of the product increases. b) negative feedback which causes the rate of the process to increase as the concentration of the product decreases. c) positive feedback which causes the rate of the process to decrease as the concentration of the product increases. d) positive feedback occurs when the rate of a process increases as the concentration of the product increases.