I believe the prohibition of interest has been a common feature of the moral rules of several civilizations. Interest was condemned by Aristotle and generally by the ethical systems of the ancient world. It was treated as a sin by the medieval Catholic Church and subject to bans and punishments. And Islam also forbids interest today, a rule that Muslims, unlike modern Christians, still regard as binding, which has driven the emergence of "Islamic banking."
Contemporary economists, by contrast, habitually regard both legal prohibitions and moral strictures against interest as pure superstition. They regard interest, on the contrary, as both necessary to the functioning of the economy, and as morally innocuous. All the prohibitions of interest by philosophers and ecclesiastics for so many centuries they regard as based on the simple fallacy that regards it as "unfair" to get more money tomorrow for money lent today because of the inequality of the sums of money involved. But of course, money-today is not the same commodity as money-tomorrow: for one thing, prices may have changed; but even if they haven't, there is a set of opportunities between today and tomorrow to which money-today gives you access and money-tomorrow doesn't. For people to exchange money-today for money-tomorrow is perfectly sensible and rational on both sides, like trading haircuts for nails or bread for cars or any other ordinary, voluntary, mutually beneficial exchange, and there's no reason that the price should be $1:$1.
Who is right? Mostly the economists. Interest is certainly necessary; it is often innocuous and useful; prohibiting loan interest is a very bad idea; and the motive for past prohibitions has usually been simple fallacies combined with the aristocratic class prejudice and philosopherly impracticality. However, there is one valid argument on the other side. Laboratory experiments have shown that people often exhibit hyperbolic discounting behavior, a fancy term meaning that they place a higher relative value on present enjoyment than is consistent with their desires when they are taking the long view. It seems to be human nature to be somewhat impulsive and to behave in ways prejudicial to one's long-run well-being, to the extent that people sometimes invest in costly self-control mechanisms. (Example: If I remember right, it has been shown statistically that people buy gym memberships even though it would be cheaper to pay per visit; the argument is that they foresee this, but are trying to bind themselves to exercise regimens by lowering the marginal cost of visiting the gym.)
If (some) people are impulsive, other people can exploit this weakness, giving them money now for prices in future money that their long-run selves would not agree to. How to do welfare analysis when people have time-inconsistent preferences presents difficulties, but plausible intertemporal utility functions would support the folk economics idea that loan sharks harm their customers. It might be useful to define usury as lending at interest that exploits people's impulsive short-sightedness, and interest as lending at interest to rational borrowers who have good reasons to place especially high value on money-today. Of course, an external observer couldn't always tell, and you might never be completely certain, whether any given transaction was a case of usury or interest. Even the lender and the borrower might not know. Indeed they might know least of all: they would have the best information, but maybe also incentives for self-deceit.
I think the Christian attitude should favor interest, thus defined, and oppose usury. It should be regarded as a sin to lend money at interest if the lender has strong reasons to think that the borrower is being impulsively short-sighted and will regret the loan later. It might also be good for the law to prohibit usury. This is paternalistic, but perhaps not coercively so, The law could (maybe it does, I'm not sure) simply say, "We define such-and-such contracts as usurious and therefore invalid, and we will not enforce them. If a usurious lender wants to simply trust his borrowers to repay, we won't interfere, other than to make it clear to borrowers that they are entirely at liberty to walk away from such illegal debts; of course, a lender who tries to recover his money by any but purely social and moral pressure will be treated as any other extortionist."
But of course, the problem is how to prohibit usury without prohibiting interest. That can't be done perfectly. The moral usury/interest distinction will not correlate perfectly with any particular interest rate or form of contract. A loan at 0% interest might be motivated by instant gratification, while a prudent entrepreneur may occasionally have sound business reasons to borrow even at very high interest. Some entrepreneurial ventures might be recklessly self-indulgent, while other loans purely for present consumption (think of a payday loan to provide a wedding reception for one's daughter) might be quite consistent with making the best use of one's resources in the long run. The ideal might be a combination of law and moral suasion. Usury laws should prohibit the most abusive forms of lending, even at the expense of occasionally curtailing entrepreneurship; but they should allow a wide range of lending practices and rates, even though this will leave the door open to a good deal of substantive usury and exploitation. Meanwhile, churches and civil society organizations should use exhortation and stigma to shape norms so that moneyed persons will use moral discernment to try to lend only in a manner that benefits their borrowers.
A system of "morally sound" financial practices as described above would likely have prevented much of the crisis. Of course, we have some of it already: usury laws are on the books. Yet all in all our society is the opposite of the medieval Catholics: the state not only does not prohibit lending at interest, but subsidizes it. Student loans are one instance of this, and perhaps the policy of putting young people in so much debt gets less criticism than it deserves. But the most egregious example is the mortgage-interest tax deduction, which creates strong incentives for much of the population to become deeply indebted. It's clear now, in the wage of the largely mortgage-driven crisis of 2008, that much of the home mortgage industry was usurious in the sense described above, yet this industry was, and still is, being subsidized by the tax code. Surely this is perverse and should be abolished. We shouldn't go back to medieval prohibitions of usury, but perhaps something in between?
Responses to Nato:
I'm not at all sure that's true. First, the fact that the rest of the world is tanking too does not at all prove that the unfolding crisis isn't driven by events in the United States. I'm not sure anyone understands, exactly why, today as well as in 2000-01, global economic business-cycle movements are so coordinated, and certainly I don't pretend to. Yet it seems to be the case. In fact the coordinated drop in stockmarkets worldwide almost inexorably suggests that there is some powerful web of interdependency emanating from the United States. As for the PotUS's small impact on the US economy, two points: 1) that may have been true in the past, but it's less plausible today because government intervention in the economy has grown so much, and 2) presidents probably have always had much more power to hurt the economy than to help it.
Explaining stock market movements is hardly ever "easy." Politics is often the easiest explanation, but may not be the truest. The 4.2% stockmarket drop on March 2, 2009, is an exception. Obama revealed a budget that jeopardizes the long-run solvency of the United States in a way that has perhaps never been done before; markets digested the news; and got spooked. That's why I was able to predict it, which I've never tried to do before and may never do again.
How would projected deficits of trillions of dollars, deficits that will never fall below 3% of GDP under the rosiest scenarios, and then explode, be so unimportant as to "fall well below the noise floor?" I don't get it. The markets are big, but not so big that fiscal events on this scale are irrelevant. I have no idea how Obama's fiscal time bombs will play out. Maybe Congress will strip the Fed of its independence and monetize the debt through inflation. Maybe there will be a desperate class war as the government fleeces the productive classes to pay its rentiers. Maybe there will be an outright default. I think we're kidding ourselves not to admit that Obama's deficits are highly dangerous. I think they put the whole social fabric of America in jeopardy. Investors would be idiots not to foresee big trouble, and to commit to projects now is begging to be at the losing end of it.
I would hold Bush 43 responsible for these results. I've defended Bush on Iraq and tried to rein in excessive criticism on the deficit. Also I was naturally more favorable to the Bush domestic policy record in, say, 2006, than now-- "when the facts change, I change my mind," as the saying goes. At this point I'm more than ever convinced that the low spending and fiscal conservatism of the late 1990s were great for the economy, that's the bliss point we need to get back to. Clinton and the Gingrich GOP were good; Bush, not-so-good; and Obama, much worse, precisely because he's going even further in the same direction as Bush, cutting taxes and growing the government with new deficit spending.
No, it's not strange. I might be wrong on both counts, but I'd be consistent in my mistakes, attributing too much influence on the world economy to the US and the US president. Actually, recent events, precisely because of the striking degree of global coordination in the crisis, make me rather more convinced than I was that the global boom was driven by US fiscal policy (previously I was just putting it out there without attaching a high likelihood to it). But it also makes me think the boom may have been of an unsustainable, even unhealthy nature and that it's far less credit to Bush (or anyone else) than it seemed to be in 2006 or 2007.
I certainly wouldn't attribute every swing in the market to Obama's statements. The budget announcement is the most significant statement by Obama so far, because it is the strongest sign yet of what his presidency is likely to be like, and makes it look more left-liberal than it had previously seemed. It now looks unlike that Obama will be a centrist or moderate in any significant way unless the GOP wins Congress in 2010 and he has to change like Clinton did. So I do attribute the March 2, 2009 drop to Obama's statements.
More generally, I think the ongoing breakdown and transformation of the US economic constitution in the past six months, towards something far more national-socialist and corporatist, with the possibility of a level playing field for business and a stable public/private dichotomy retreating into a distant dream, is the dominant factor driving market movements in recent months. This is by no means all Obama's fault. If anything, until now, the biggest player was Henry Paulson. The trouble is that Paulson in effect greatly expanded the discretionary, arbitrary role of the federal government in the economy, and this excess power fell into the hands of Obama. Till now Obama has looked like rather hapless, but now he's asserting himself as an actor in history, and in effect he's waging class war. He doesn't know he's waging class war. Presidents usually only have a dim conception of the historical role they're playing-- Clinton had little, Bush only a bit more-- but Obama's grasp of current history is vacuous and childish to an extent that I suspect has few parallels in the history of the Republic. Suffice it to say that he thinks that his campaign slogans of "hope" and "change" meant something rather than being empty escapism useful in suckering into a coalition an array of malcontents who had nothing substantive in common, which even his cannier supporters knew full well would be exposed as a travesty as soon as he came into office. He thinks that the liberal counter-narrative of the Bush years was not only a coherent view-- as opposed to a collection of fashionable sneers of latte liberals insulated from responsibility-- but the obvious truth, to which indeed Obama lacks the curiosity to explore the alternatives. So Obama thinks he's just doing the right thing, acting on the liberal pieties that all right-thinking people knew we ought to do all along and didn't because we were "irresponsible." But what he's really doing is waging class war.
The deficit, in particular, is an instrument of class war. It hangs the threat of future tax hikes over the heads of anyone, and investors in new capital particularly, who does anything that will lead to a high future income. Of course, it might work out differently: maybe the rentiers, the holders of currency and government bonds, will be on the losing end of the class war, if we monetize the debt through inflation. Obama's tax hikes on the rich I would not class war, if the rich would get something in return, such as a reduction of the deficit that would help raise the stockmarket and put some value into 401(k)s. But now Obama wants to raise taxes on the well-off and exacerbate the deficits that only point to more tax hikes later. And he's raising taxes, such as capital gains, that are especially destructive to incentives. The Atlas class, the class that is at the heart of the nexus of making and doing in this country, is under siege.
The growth of deficits is certainly something Bush can be blamed for. I think it's a big part of the cause of the present crisis. But Obama's deficits are on a new order. With Bush, you could argue, though only just, that the deficits were sustainable, and that we might be able to keep paying the bills without a radical fiscal reorientation. I don't see how that's possible now. If I were a representative of the US Treasury trying to explain why it was sensible to lend money to the US, how, given recent political trends, we're going to manage not to go broke in the long run, I don't think I could do it.
I don't think there's a better explanation that that for why the markets are running scared. Or even close.