According to the talk, what is the price system primarily related to?

Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a very complex network composed of the products bought and sold in the economy, as well as of a myriad of services, including labor, professional transportation, and public-utility services. The interrelationships of all these prices make up the system of prices. The price of any particular product or service is linked to a broad, complicated system of prices in which everything seems to depend more or less upon everything else.
    If one were to ask a group of randomly selected individuals to define price, many would reply that price is an amount of money paid by the buyer to the seller of product or service or in other words, that price is the money value of a product or service as agreed upon in a market transaction. This definition is, of course valid as far as it goes. For a couple prices determine how resources are to be used. They are also the means by which products, and services that are in limited supply are rationed among buyers. For a complete understanding of a price in any particular transaction, more than the amount of money involved must be known. Both the buyer and the seller should be familiar with not only the money amount, but with the amount and quality of the product or service to be exchanged, the time and place at which the exchange will take place and payment will be made, the form of money to be used, the credit terms and discounts that supply to the transaction, guarantees in the product or service, delivery terms, return privileges, and other factors. In other wrests, they should evaluate all the factors that comprise the total package.