You can’t read models, but you do talk to entrepreneurs in Racine and Yakima. Higher deficits will make them more insecure and more risk-averse, not less. They’re afraid of a fiscal crisis. They’re afraid of future tax increases. They don’t believe government-stimulated growth is real and lasting. Maybe they are wrong to feel this way, but they do. And they are the ones who invest and hire, not the theorists.

The Demand Siders are brilliant, but they write as if changing fiscal policy were as easy as adjusting the knob on your stove. In fact, it’s very hard to get money out the door and impossible to do it quickly. It’s hard to find worthwhile programs to pour money into. Once programs exist, it’s nearly impossible to kill them. Spending now creates debt forever and ever.

Moreover, public spending seems to have odd knock-off effects. Professors Lauren Cohen, Joshua Coval and Christopher Malloy of Harvard surveyed 42 years of government spending increases in certain Congressional districts. They found that federal spending increases dampened corporate hiring and investment in those districts. You wish somebody could explain that one to you before you pass on more debt burdens to your grandchildren.

So you have your doubts, but you are practical. You want to do something. Too much debt could lead to national catastrophe. Too much austerity could lead to stagnation.

Well, there’s a few short-term things you can do. First, extend unemployment insurance; that’s a foolish place to begin budget-balancing. Second, you need to mitigate the pain caused by the state governments that are slashing spending. You need a program modeled on Race to the Top. You will provide federal money now to states that pass responsible long-term budget plans that will reduce spending and pension commitments. That would save public-sector jobs and ease contractionary pressures without throwing the country into a fiscal-debt spiral.

But the overall message is: Don’t be arrogant. This year, don’t engage in reckless new borrowing or reckless new cutting. Focus on the fundamentals. Cut programs that don’t enhance productivity. Spend more on those that do.

You don’t have the ability to play the economy like a fiddle. You do have the ability to lay some foundations for long-term growth and stability.