<span style、"font-family: 宋体; font-size: small;"><span>菜单成本说</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>合同的交错签订</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>集体谈判理论</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>交错价格调整论</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>效率工资论</span></span>