Comparative advantage is a theory based on relativity. If a country or company is relatively better at making a product, it should make that product and not something else.
The current fee is $39.99 for a single account and $59.99 for a joint account (annually). Pre-Buy** - This is a program that enables the customer to lock-in the propane price in advance for the customer's projected winter/annual usage.
Rating Newest Oldest. Best Answer: Propane is one type of LP fuel. LP stands for liquified petroleum. LP can be 100% propane, a mixture of propane and butane, or butane. Most LP fuels are 100% propane unless specified by the supplier.