Authoritative estimates suggest that currently union workers on the average:

Question $2$ options:

$1)$

achieve no wage advantage over nonunion workers in the same occupation.

$2)$

realize a $5$ percent wage advantage over nonunion workers in the same occupation.

$3)$

realize a $20-30$ percent wage advantage over nonunion workers in the same occupation.

$4)$

realize a $15$ percent wage advantage over nonunion workers in the same occupation.