The price of a(n) is usually based on value to the user/consumer, but when a(n) is sold, the seller ceases to own it.

The question seems to be centered around the concept of economic goods and ownership transfer. In this case, the items being referred to appear to be "goods" or "products."

Explanation

1. Goods/Products: The price of goods or products is typically determined by their perceived value to the consumer. This value can fluctuate based on demand, quality, and rarity.

2. Ownership Transfer: When a good or product is sold, the seller relinquishes ownership. This signifies a transaction in which the rights to the product are transferred from the seller to the buyer.

In summary, the blanks in the sentence likely refer to "goods" for the first blank and "product" for the second blank. Hence, you could complete the sentence as follows:

"The price of a good is usually based on value to the user/consumer, but when a product is sold, the seller ceases to own it."

This highlights the relationship between value, transaction, and ownership within the context of economics.