The objective of this study is to investigate further the interplay between corporate governance and firm performance with special focus on a situation expected to bring larger agency costs to the firm, that is, when voting rights of the dominant shareholder exceed his/her cash flow rights.
The research is conducted in Canada over a four‐year period from 2002 to 2005 and uses a balanced sample of 130 firms or 520 firm‐year observations. Corporate governance is measured based on the ROB corporate governance index published by The Globe and Mail.
The results clearly show a positive and significant relationship between the ROB governance scores and Tobin's Q, when there is a separation between voting and cash flow rights. In the absence of any excess voting rights, no significant relation is found between governance and performance.
The findings suggest that regulators need to exercise caution before deciding whether or not to recommend or impose corporate governance rules for all firms, since the benefits of these rules may vary among the firms.
The study contributes to explaining mixed international evidence on the governance‐performance relationship, while directing attention to the moderating effect of the deviation from the one share‐one vote principle. To the best of the authors' knowledge, no other study using corporate governance indices has taken into account the impact of excess voting rights despite the widespread use of that practice outside the USA.
