Problems with the Slovakia theory:
- GDP growth was actually pretty good before the tax reforms were implemented, averaging ~4.5 - 5% per year for the 3 years before the tax reforms. And GDP growth ROSE every year from 1999-2004. So it's a bit iffy to label a change in legislation from 2004 as being responsible for the rises from 2004-2007 in GDP growth. There was a previous 5 year-long boom with GDP growing faster (even in percentage terms) every year. So, GDP growth rising again in the next couple of years after that would just be expected even without the tax changes. There was no "new trend" in GDP that can be attributed to the tax cuts.
In fact, by 2007 the economy collapsed, only 3 years after the tax reforms came in. So you have 3 years of good growth, which you attribute to the tax changes. but tax changes just don't cause that sort of growth spurt
instantly, they actually take a couple of years to kick in, as investment shifts. So in other words at the peak point where the tax reforms should have fixed things, a 10 year trend of improving GDP growth suddenly failed in a catastrophic decline.
As for government spending: it fell from
55% GDP in 2001, to 40% GDP in January of 2004. And 2004 was the year of the tax reforms. It was already on a downhill trend, but that pretty much flattened out 2 years after the tax reforms. There was a 15% decline before the tax reforms and another 5% after the tax reforms, not the 10% change from 45% - 35% you cited: that has one name,
bullshit intended to deceive you. Declines in government spending slowed down after the reforms, they didn't speed up. It's definitely in the "your being lied to" category, because even that 10% decline you noted? Most of it happened before the tax reforms.
My theory is that the government knew there was already a boom on, and they took the opportunity to slash taxes on the rich because they knew this would be hidden in the rising revenues from taxes they were already getting.