No doubt there is plenty of wasteful and inefficient government spending. But I don't think the opportunity trade off works like you suggest.
It's not as if the government is removing otherwise productive dollars out of the economy to fund its deficits. Treasuries are generally purchased with excess reserves from the primary dealer banks that would otherwise just sit there. Or foreign governments, corporations, institutional buyers looking to stash their cash holdings where they will accrue risk free interest.
We can quibble about multipliers, but deficits represent a net income flow into the private sector and hence have an expansionary effect on demand (even if, unfortunately, those dollars are flowing into the pockets of crony defense contractors and what not).
It's not as if the government is removing otherwise productive dollars out of the economy to fund its deficits. Treasuries are generally purchased with excess reserves from the primary dealer banks that would otherwise just sit there. Or foreign governments, corporations, institutional buyers looking to stash their cash holdings where they will accrue risk free interest.
We can quibble about multipliers, but deficits represent a net income flow into the private sector and hence have an expansionary effect on demand (even if, unfortunately, those dollars are flowing into the pockets of crony defense contractors and what not).