Charles Blahous, a senior research fellow at the Mercatus Center, published a study last week about the disastrous effect of Obamacare on the budget deficit–in direct contrast to claims by the Obama administration (supported by the Congressional Budget Office) that the law would reduce the deficit. Blahous estimates that over 10 years, Obamacare will add a net $1.15 trillion to the federal deficit.

Some observers, notably Paul Krugman, criticized Blahous’s study. Blauhous responds to their criticisms in a new blog post at e21: