Who is voluntary to answer my question.
谁愿意回答我的问题
The number one answer is, as previously stated, to promote voluntary compliance.
第一个回答就是，正如上文所言，促使人们自觉遵守。
The traditional answer is that both sides should gain from any voluntary exchange.
传统的答案是，双方都应受益于自愿交换。
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