David Rosenberg: Why Trump's infrastructure and tax-cut plans will pave the road to economic ruin

Much is being made about the incoming Trump administration's infrastructure spending plan, as if this is a new invention. Capital stock upgrades are needed, that much is true. But they won't dial up growth that much. U.S. President Barack Obama, if you remember, signed an $830 billion, 10-year infrastructure plan into law in 2009. It hasn't…