Generate a full, in-depth guide on the psychology of pricing. The guide must go beyond basic strategies and explore psychological tactics. It should include detailed sections with real-world examples on: 1. Price Anchoring: How to set a reference point for your customers. 2. Decoy Pricing: The strategy of using a third option to make one option look better. 3. Charm Pricing: The science behind why prices ending in 9 or 99 work. 4. The Psychology of 'Free.' 5. How to frame your price in terms of value and benefits. Please include a disclaimer about the ethical use of these techniques.