Sam has been working in the same position without any promotion or salary increase for 2 years. He currently makes $45,000 per year, but he thinks that someone with his experience should make $50,000. During his annual appraisal, he approaches the topic with his boss. Sam asks for a $10,000 a year raise. His boss says that the current budget cannot support such an increase. Sam then asks for a $5,000 a year raise, and his boss agrees. Which technique did Sam use to attain compliance from his boss