A purchasing agent is responsible for the procurement of goods and services for their company, while buyers are responsible for the purchase of merchandise for resale. The main difference between the two positions is that purchasing agents usually work in manufacturing or wholesale companies, while buyers usually work in retail stores. The main difference between a purchasing agent and a procurement officer is that purchasing agents are responsible for the purchase of goods and services, while procurement officers are responsible for the entire procurement process. This includes planning, organizing, and controlling the procurement process.