My take on this is that the consensus of economists is likely to be more reliable on microeconomic issues than it is on macroeconomic issues. In my view, fundamental macroeconomic issues are unsettled. It makes sense to have what a Bayesian statistician would call “diffuse priors” and what an ordinary layman would call an open mind.
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What is important to bear in mind is that just because economists cannot settle disputes about macro does not mean that all of economics is bunk or that nowhere is there a reliable consensus in economics. Macroeconomics is only one area of economics.

I whole-heartedly agree, albeit with a simple addition:  To the typical person on the street, I suspect that  economics is thought of as a combination of finance and macroeconomics.  Other sub-disciplines are rarely imagined.

Brad DeLong has written a short and much celebrated essay (available on Cato and his own site) on the financial crisis and (consequently) why investors currently love government debt and hate everything else.  I’ll add my voice to those suggesting that you read the whole thing.  Here is the crux of it:

[T]he wealth of global capital fluctuates … for five reasons:

1. Savings and Investment: Savings that are transformed into investment add to the productive physical — and organizational, and technological, and intellectual — capital stock of the world. This is the first and in the long run the most important source of fluctuations — in this case, growth — in global capital wealth.
2. News: Good and bad news about resource constraints, technological opportunities, and political arrangements raise or lower expectations of the cash that is going to flow to those with property and contract rights to the fruits of capital in the future. Such news drives changes in expectations that are a second source of fluctuations in global capital wealth.
3. Default Discount: Not all the deeds and contracts will turn out to be worth what they promise or indeed even the paper that they are written on. Fluctuations in the degree to which future payments will fall short of present commitments are a third source of fluctuations in global capital wealth.
4. Liquidity Discount: The cash flowing to capital arrives in the present rather than the future, and people prefer — to varying degrees at different times — the bird in the hand to the one in the bush that will arrive in hand next year. Fluctuations in this liquidity discount are yet a fourth source of fluctuations in global capital wealth.
5. Risk Discount: Even holding constant the expected value and the date at which the cash will arrive, people prefer certainty to uncertainty. A risky cash flow with both upside and downside is worth less than a certain cash flow by an amount that depends on global risk tolerance. Fluctuations in global risk tolerance are the fifth and final source of fluctuations in global capital wealth.

In the past two years the wealth that is the global capital stock has fallen in value from $80 trillion to $60 trillion. Savings has not fallen through the floor. We have had little or no bad news about resource constraints, technological opportunities, or political arrangements. Thus (1) and (2) have not been operating. The action has all been in (3), (4), and (5).

As far as (3) is concerned, the recognition that a lot of people are not going to pay their mortgages and thus that a lot of holders of CDOs, MBSs, and counterparties, creditors, and shareholders of financial institutions with mortgage-related assets has increased the default discount by $2 trillion. And the fact that the financial crisis has brought on a recession has further increased the default discount — bond coupons that won’t be paid and stock dividends that won’t live up to firm promises — by a further $4 trillion. So we have a $6 trillion increase in the magnitude of (3) the default discount. The problem is that we have a $20 trillion decline in market values.

Some people have criticised Brad for his characterisation of the liquidity discount, suggesting that he has confused it with the (pure) rate of time preference.  I don’t think he is confused.  Firstly because he’s a genuine expert in the field and if he’s confused,  we’re in big trouble; and secondly because the two concepts are interlinked.

The liquidity discount is that an inability to readily buy or sell an asset – typically evidenced by low trading volumes and a large bid/ask spread – reduces it’s value.

The pure rate of time preference is a measure of impatience.  $1 today is preferred over $1 tomorrow even if there is no inflation. [Update: see below]

The two are linked because if you want to sell assets in an illiquid market, you can either sell them at a huge discount immediately or sell them gradually over time.  The liquidity discount is (presumably) therefore a monotonically increasing function of the pure rate of time preference for a given level of liquidity.

Minor update:

A more correct illustration of the pure rate of time preference would be to say:

Suppose that you could get a guaranteed (i.e. risk-free) annual rate of return of 4% and there is no inflation.  A positive pure rate of time preference says that $1 today is preferred over $1.04 in a year’s time.

What I call the “suits vs. geeks divide” is the discrepancy between knowledge and power. Knowledge today is increasingly dispersed. Power was already too concentrated in the private sector, with CEO’s not understanding their own businesses.

But the knowledge-power discrepancy in the private sector is nothing compared to what exists in the public sector. What do Congressmen understand about the budgets and laws that they are voting on? What do the regulators understand about the consequences of their rulings?

We got into this crisis because power was overly concentrated relative to knowledge. What has been going on for the past several months is more consolidation of power. This is bound to make things worse. Just as Nixon’s bureaucrats did not have the knowledge to go along with the power they took when they instituted wage and price controls, the Fed and the Treasury cannot possibly have knowledge that is proportional to the power they currently exercise in financial markets.

I often disagree with Arnold’s views, but I found myself nodding to this – it’s a fair concern.  I’ve wondered before about democracy versus hierarchy and optimal power structures.  I would note, however, that Arnold’s ideal of the distribution of power in proportion to knowledge seems both unlikely and, quite possibly, undesirable.  If the aggregation of output is highly non-linear thanks to overlapping externalities, then a hierarchy of power may be desirable, provided at least that the structure still allows the (partial) aggregation of information.

Betsey Stevenson and Justin Wolfers wrote an article for Cato Unbound: “Marriage and the Market“. Here is a brief summary of their idea (the exact snippet chosen is stolen directly from Arnold Kling):

So what drives modern marriage? We believe that the answer lies in a shift from the family as a forum for shared production, to shared consumption…the key today is consumption complementarities – activities that are not only enjoyable, but are more enjoyable when shared with a spouse. We call this new model of sharing our lives “hedonic marriage”.

…Hedonic marriage is different from productive marriage. In a world of specialization, the old adage was that “opposites attract,” and it made sense for husband and wife to have different interests in different spheres of life. Today, it is more important that we share similar values, enjoy similar activities, and find each other intellectually stimulating. Hedonic marriage leads people to be more likely to marry someone of their similar age, educational background, and even occupation. As likes are increasingly marrying likes, it isn’t surprising that we see increasing political pressure to expand marriage to same-sex couples.

…the high divorce rates among those marrying in the 1970s reflected a transition, as many married the right partner for the old specialization model of marriage, only to find that pairing hopelessly inadequate in the modern hedonic marriage.

It produced a flurry of responses and reactions, but the chain I want to follow is this one:

• From The Economist’s in-house blogger(s): “The age of hedonic marriage“
• In turn, Bryan Caplan wondered: “How Can Guys Be So Lazy Around the House?“
• Megan McArdle took umbrage with Bryan’s views in: “Marriage minded“
• Finally, Tyler Cowen, who had already encouraged his readers to look at Betsey and Justin’s piece, reacted to Bryan and Megan with: “Bargaining theory“

Which finally brings me to why I wrote this entry. I love this sentence from Tyler:

Symbolic goods usually have marginal values higher than their marginal costs of production; Americans for instance love the idea of their flags but the cloth is pretty cheap, especially if it comes from China.

Brilliant.