Over the past two weeks, public sector unions in Wisconsin and other states have staged protests against some ...legislators' attempts to restrict collective bargaining power -- in effect, taking away a union's right to negotiate over salary, seniority, pensions, health care and other work-related issues. The clash has set off debates about budget shortfalls, political posturing and most of all, the role that unions play in today's economy. Wharton professors Janice Bellace and Peter Cappelli offer their views on the standoff.