In my view, the jury is out on the effect.
On the one hand, stimulus means more money in hands ready to spend it, helping GDP, spurring demand, and contributing to inflation.
On the other hand, is GDP growth very meaningful if the growth comes entirely from the government showering everyone with free money? What happens when the spigot is turned off?
As far as the 10-year, Powell has said that he wants inflation, and the interpretation was that he will not step in to cap rates. However, in the days prior to his latest announcement, market gurus were certain that the Fed would be stepping in soon, because higher rates are a very big problem as it will increase borrowing costs and servicing costs. How will the government be able to pay increased rates on debt? By printing even more money? Where does it end? When does the market lose confidence in the currency and lead to a collapse?
We've seen Powell say similar two years ago - when he was set on raising rates. Within a few weeks, as the market and POTUS muscled him to do otherwise, he completely reversed course and lowered rates multiple times.
As far as the market reaction - it all continues to be extremely overvalued in my view. The market has and continues to be extremely irrational. That is why we see so many ridiculous things happening - Gamestop, Bitcoin, NFT, SPACs - the list goes on and on.
Best advice - watch your step.