But if people aren't forced to provide their labor by virtue of a sufficient BI, there is no longer that imbalance. Since individuals' needs are taken care of, the cost of labor as opposed to idleness is whatever dis-utility the potential worker finds in the task, and if the pay is below that we can expect them not to take the job. Again, if you run through the benefits you claim for MW, every one is provided by a sufficient BI even in the absence of MW.