It does seem trivial that taxes stifle economic growth, however, isn't this under the assumption that people will spend the money they garner on tax breaks rath

It does seem trivial that taxes stifle economic growth, however, isn't this under the assumption that people will spend the money they garner on tax breaks rather than sit on it? Although the government is laughably inefficient, wouldn't it be more productive to increase taxes and then have the government spend because the government is guaranteed to spend all of it?