Offering subsidies to attract business away from its original source should be banned completely, nationally and internationally. In the small print of voluminous trade treaties it is overlooked because who benefits; the individual businesses being supported by taxpayers. If you can ban dumping, counter vailing and all the other tricks of the trade you can ban corporate subsidies and it should be done asap. I understand subsidies to the aerospace industry is one of the things Trump has his eye on as a trade violation by Canada... not realistic considering the US also offers generous subsidies to its aerospace  and agriculture and many other industries.. all it does is beggar the taxpayer while the industries play one area off against another ..