If my previous post was a bit harsh on the Adam Smith Institute, here's a payback - more evidence that flat taxes can be good for the poor and for the whole economy:
We quantify the aggregate, distributional and welfare consequences of two revenue neutral flat-tax reforms using a model economy that replicates the U.S. distributions of earnings, income and wealth...In both flat-tax reforms the income poor pay less income taxes and obtain sizeable welfare gains...Economic folklore has defended progressive taxation on the grounds that it is good for the poor: we find that flat taxes can be better.
There's just one problem - the more egalitarian flat-tax reform would cut output a little. But hey, there are alway trade-offs.
A reminder: Here's research (pdf) showing how a flat tax would affect the Spanish economy. Here's something I said about the link between flat taxes and equality.