Subscription Pricing Models
Fixed/Flat-Rate - one product with a single set of features and a set monthly subscription price. Example, a subscription to the New York Times for $10 a month.
Tiered - Merchants using this model package products and services into several tiers adapted for different groups of customers. Example, typically three tiers such as Basic, Standard, Premium
Usage-Based / Pay-As-You-Go - Users are charged based on how much of a product or service they consume. Example, a cell phone company has bundles for data packages.
Per-User - Merchants charge customers per number of users they include in the subscription. X number of users for X dollars.
Inflation - the increase in the prices of goods and services over time.