<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Explain the concept of supply and demand. Context: Supply and demand is a basic economic principle that describes the relationship between producing goods and their desirability.

4. Answer: [/INST]It is a basic economic principle that describes the relationship between producing goods and their desirability.</s>