<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:  What is the concept of opportunity cost in economics? Context: Opportunity cost in economics refers to the value of the next best alternative foregone when a decision is taken. Answer: [/INST]The opportunity cost is the value of the next best alternative forgone when a decision is made.</s>