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.
Liquid propane gas. With gas grills you have your choice of liquid propane (LP) or natural gas (NG). 15 pounds LP comes in 20 pound steel tanks. If you have an LP grill you should always have a full backup tank on hand.