What the Democratic Alliance (DA) political party in South Africa really stand for?

The DA (Democratic Alliance) is a political party in South Africa (they are the official opposition to the ANC (African Nationalist Congress) but seem to have muddled policies - what I am particularly interested are their Economic Policies. Are they proponents for a Free Market system and if so why are they hassling the hawkers in Cape Town - is it only to please their white supporters?