Final answer:
The two underlying principles of the chain of demand are the unity of demand and the scale of demand.
Step-by-step explanation:
The statement in the question is false. The two underlying principles of the chain of demand are the unity of demand and the scale of demand, not the scalar principles. The principle of unity of demand states that demand is the sum total of individual demands in the market, while the principle of scale of demand refers to the different quantities of a product that consumers are willing and able to purchase at different price levels.