Republican tax plans don't add up

[stpioc]

According to Cruz, lower tax rates will spur economic growth because of stronger incentives to work and save. 

This is actually pretty funny. One of the reasons the world economy is experiencing problems is because there is a savings glut, that is, desired savings exceed desired investment by a fairly wide margin.

This is why interest rates are so low, and there is hardly any inflation. The way increased saving is supposed to spur economic growth is by lowering interest rates, which would spur investment. 

But interest rates are already rock bottom in most of the developed world, and investment isn't actually very interest rate sensitive anyway.

Even more funny, when central banks try to do the same, they get denounced by market fundamentalists as irresponsible debasers of the currency, producing even open letters to the Fed denouncing them.