voluntary bargaining

基本解释

When we found Chinese characteristic plea bargaining system, we must follow certain principles, for instance the voluntary principle of party.
构建有中国特色的辩诉交易制度必须遵循一定的原则，如当事人自愿原则；

And thanks to the legal fiction that plea bargaining is a voluntary negotiation between the prosecutor and defendant, our justice system effectively gives people dramatically longer sentences for exercising the right to have a trial at all.
FORBES: Aaron Swartz and the Corrupt Practice of Plea Bargaining
But the unions and collective bargaining agreements we have were not created under circumstances of voluntary exchange, and restrict freedom more significantly than right-to-work does.
FORBES: Does Right-to-Work Increase or Decrease Freedom?