David Sandahl, managing partner of Decision Consulting in Pennington, has been viewing the world through an economic prism since majoring in economics at Bowdoin College. For him, the severe downturn we are living through is not a surprise. “This great recession is the product of at least a decade and maybe a generation of bad public and private choices,” he says. “We have managed to distort the economy in ways it can’t sustain itself to go forward, and we are ill-prepared for the challenges of the 21st century.”