Apparently trickle down economics is not very good helps create inequality, which leads to lower economic growth. Better to give breaks to the poor to help them spend money which has a bigger impact on economic growth.
http://www.cbc.ca/news/business/income-inequality-hurts-economy-study-suggests-1.3115232
The Economist has a somewhat similar story too.
http://www.cbc.ca/news/business/income-inequality-hurts-economy-study-suggests-1.3115232
The Economist has a somewhat similar story too.