The U.S. House of Representatives approved a $4.1 trillion budget plan today. That brings us closer to a tax overhaul, because the passage of the spending blueprint will make it easier for Republicans to push a tax plan through. That’s not to say it will be easy: There are a whole lot of big-deal questions up in the air. Among them is how to judge a tax plan, or “score” it. “Dynamic scoring” will be a part of that discussion. That’s a tool that causes policy pundits to freak. Why? 

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