This part catches my eye (bolding mine):
However strongly we believe in free markets (not, perhaps, as fervently as we did a year or two ago), the theme of forgiveness does run strongly through religious writings of all sorts. In the Old Testament, for instance, Chapter 15 of the book of Deuteronomy calls for the forgiveness of debts once every seven years.Religious leaders were aware, however, of the chilling effect that could have on lending (particularly in the sixth year). “The Torah says don’t think that way, don’t be stingy” in that sixth year, said Rabbi Mark Washofsky."
I could replace "stingy" with "rational" here. This is one part of Scripture that is clearly God calling us to behave spiritually, rather than rationally. I wrote a series on this subject before, I would add this topic as a chapter in the book (if I ever write one).
It's perfectly rational behavior not to lend to someone when you know you're not going to get paid back, yet we're called to do it anyway. That is unprofitable and the loan just shouldn't be made, especially if you have shareholders to answer to. The borrower also has a clear incentive to not pay off his debts, just hold out for year 7. But not repaying your debts is called stealing, so he too is being called to behave spiritually.
Our markets require rational behavior in order to work properly. Economists would consider God's markets disfunctional.