Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why would a company have 2 listings on the same exchange?
Some companies like Royal Dutch Shell have multiple share classes to suit the tax regimes in Holland and the UK the A shares have dutch withholding tax applied and the B shares dont.  Also some split capital investment trusts have multiple share classes http://www.trustnet.com/Education/Split.aspx?ms=1