What is the full form of MRP in the context of consumer goods?

Consider the following statements regarding unfair trade practices: 1. Adulteration is a practice where products are intentionally degraded by adding inferior substances. 2. Misleading advertisements always contain factual information presented truthfully. 3. Underweight and under-measurement refer to sellers giving consumers less quantity than what is paid for. 4. Hoarding is an artificial practice of creating scarcity by holding back stocks to raise prices. How many of the statements given above are correct?

When students maintain a daily record of their personal expenses for a week, it practically teaches them: