1. A primary energy source is an energy source that can be consumed directly or converted into something else, like electricity. The most common are oil and 2. Roughly of the natural gas consumed in the United States goes into power plants. 3. Physical products are those whose contracts involve the Physical market participants are in the market to delivery of the commodity. products do not involve delivery of gas or electricity; instead, involve the exchange of money. 5. Under "Physical Fundamentals, these 3 major constraints listed. Summarize what they mean a) Limited customer storage options: 4. b) Substitutes c) Necessity 1. A primary energy source is an energy source that can be consumed directly or converted into something else, like electricity. The most common are oil and 2. Roughly of the natural gas consumed in the United States goes into power plants. 3. Physical products are those whose contracts involve the Physical market participants are in the market to delivery of the commodity. products do not involve delivery of gas or electricity; instead, involve the exchange of money. 5. Under "Physical Fundamentals, these 3 major constraints listed. Summarize what they mean a) Limited customer storage options: 4. b) Substitutes c) Necessity