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December 25, 2011

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Posted: 25 Dec 2011 12:06 AM PST

Twas the Night Before Christmas

Posted: 24 Dec 2011 06:31 PM PST

This is a repeat from previous years, something my grandfather read to us each Christmas Eve, Twas The Night Before Christmas (other repeats: What Happens at the North Pole Stays at the North Pole... and "Sinte Klaas"):



L2_1 was the night before Christmas, when all through the house
Not a creature was stirring, not even a mouse;
The stockings were hung by the chimney with care
In hopes that St. Nicholas soon would be there;

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L3 he children were nestled all snug in their beds,
While visions of sugar-plums danced in their heads;
And mamma in her kerchief, and I in my cap,
Had just settled our brains for a long winter's nap,


L4 hen out on the lawn there arose such a clatter,
I sprang from the bed to see what was the matter.
Away to the window I flew like a flash,
Tore open the shutters and threw up the sash.


L5 he moon on the breast of the new-fallen snow
Gave the lustre of mid-day to objects below,
When, what to my wondering eyes should appear,
But a miniature sleigh, and eight tiny reindeer,

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L6 ith a little old driver, so lively and quick,
I knew in a moment it must be St. Nick.
More rapid than eagles his coursers they came,
And he whistled, and shouted, and called them by name:

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L7 ow, Dasher! now, Dancer! now, Prancer and Vixen!
On, Comet! on, Cupid! on, Donder and Blitzen!
To the top of the porch! to the top of the wall!
Now dash away! dash away! dash away all!"





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L8 s dry leaves that before the wild hurricane fly,
When they meet with an obstacle, mount to the sky;
So up to the house-top the coursers they flew,
With the sleigh full of Toys, and St. Nicholas too.

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L9 nd then, in a twinkling, I heard on the roof
The prancing and pawing of each little hoof.
As I drew in my head, and was turning around,
Down the chimney St. Nicholas came with a bound.

L10 e was dressed all in fur, from his head to his foot,
And his clothes were all tarnished with ashes and soot;
A bundle of Toys he had flung on his back,
And he looked like a peddler just opening his pack.


L11 is eyes—how they twinkled! his dimples how merry!
His cheeks were like roses, his nose like a cherry!
His droll little mouth was drawn up like a bow,
And the beard of his chin was as white as the snow;


L12 he stump of a pipe he held tight in his teeth,
And the smoke it encircled his head like a wreath;
He had a broad face and a little round belly,
That shook when he laughed, like a bowlful of jelly.


L13 e was chubby and plump, a right jolly old elf,
And I laughed when I saw him, in spite of myself;
A wink of his eye and a twist of his head,
Soon gave me to know I had nothing to dread;


L14 e spoke not a word, but went straight to his work,
And filled all the stockings; then turned with a jerk,
And laying his finger aside of his nose,
And giving a nod, up the chimney he rose;


L15 e sprang to his sleigh, to his team gave a whistle,
And away they all flew like the down of a thistle.
But I heard him exclaim, ere he drove out of sight,
"Happy Christmas to all, and to all a good-night."

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Fiscal Policy Can Help the Economy

Posted: 24 Dec 2011 02:46 PM PST

For the doubters:

Fiscal Policy Works, by Paul Krugman: Via Brad DeLong, there's a paper by David Romer (pdf) summarizing recent research on fiscal policy, inspired by the crisis and aftermath. And his conclusion is not at all what you hear on the talk shows; it is that there is now overwhelming evidence that fiscal policy does in fact work when it's not offset by monetary policy. And since we're now in a liquidity trap in which conventional monetary policy has no traction, that's the world we're in.

And for the austerity minded, stabilization policy works the same in both directions -- expansionary policy is expansionary, and contractionary policy is contractionary.

Hoping Employment Takes Off...

Posted: 24 Dec 2011 12:51 PM PST

Landing...but can't help worrying that this will happen.

Things do look better, but assuming recent trends don't end up like the skier in the link the question is how strong growth will be. Will it be just enough to absorb population growth, but no more? Or will there be an acceleration of growth that allows us to provide jobs for new entrants to the labor force and also begin to reemploy the milllions of people who lost jobs during the recession and have had no luck finding new ones?

I wish I was confident that will happen, and happen fairly soon. In the past, such bursts of activity during the recovery phase were normal and expected. But as I noted recently, it's hard to see where the needed jump in demand will come from: matter which sector you point to, government, business, households, or foreigners, there is little reason to expect the large increase in demand needed to drive an economic recovery. Things are looking better, and the green shoots might just be real this time around, but we are still a long, long way from returning to whatever our new normal might be.

It doesn't have to be this way. Although recessions that are caused by financial collapses are among the most difficult to recover from and lost decades are not at all unusual, as Christina Romer recently highlighted effective government policy (monetary and fiscal) can shorten the recovery time considerably.

As policymakers head home for the holidays, I hope they will give some thought to the families that could be having a much merrier Christmas if they had pursued more aggressive policy. And if they (and the powerful interests pulling their strings) do have such a "Christmas Carol" revelation, I hope they will also realize that it's not too late to do more.

I know this is a wish that's unlikely to come true -- we'll be lucky to avoid job-killing austerity measures in the coming year (lumps of coal for all!). But it's Christmas Eve, and maybe Santa will bring a surprise.

Totally Doable?

Posted: 24 Dec 2011 10:28 AM PST

The Atlantic says:

There are just over 526,000,000 Christian kids under the age of 14 in the world who celebrate Christmas on December 25. In other words, Santa has to deliver presents to almost 22 million kids an hour, every hour, on the night before Christmas. That's about 365,000 kids a minute; about 6,100 a second. Totally doable.

On the "totally doable" point, an old post (2005) gives the physicist's view:

Is there a Santa Claus? - a physicist view : Consider the following:

1) No known species of reindeer can fly. But there are 300,000 species of living organisms yet to be classified, and while most of these are insects and germs, this does not COMPLETELY rule out flying reindeer which only Santa has ever seen.

2) There are 2 billion children (persons under 18) in the world. BUT since Santa doesn't (appear) to handle the Muslim, Hindu, Jewish and Buddhist children, that reduces the workload to 15% of the total - 378 million according to Population Reference Bureau. At an average (census) rate of 3.5 children per household, that's 91.8 million homes. One presumes there's at least one good child in each.

3) Santa has 31 hours of Christmas to work with, thanks to the different time zones and the rotation of the earth, assuming he travels east to west (which seems logical).

This works out to 822.6 visits per second. This is to say that for each Christian household with good children, Santa has 1/1000th of a second to park, hop out of the sleigh, jump down the chimney, fill the stockings, distribute the remaining presents under the tree, eat whatever snacks have been left, get back up the chimney, get back into the sleigh and move on to the next house.

Assuming that each of these 91.8 million stops are evenly distributed around the earth (which, of course, we know to be false but for the purposes of our calculations we will accept), we are now talking about .78 miles per household, a total trip of 75-1/2 million miles, not counting stops to do what most of us must do at least once every 31 hours, plus feeding and etc.

This means that Santa's sleigh is moving at 650 miles per second, 3,000 times the speed of sound. For purposes of comparison, the fastest man- made vehicle on earth, the Ulysses space probe, moves at a poky 27.4 miles per second - a conventional reindeer can run, tops, 15 miles per hour.

4) The payload on the sleigh adds another interesting element. Assuming that each child gets nothing more than a medium-sized lego set (2 pounds), the sleigh is carrying 321,300 tons, not counting Santa, who is invariably described as overweight.

On land, conventional reindeer can pull no more than 300 pounds. Even granting that 'flying reindeer' (see point #1) could pull TEN TIMES the normal amount, we cannot do the job with eight, or even nine.

We need 214,200 reindeer. This increases the payload - not even counting the weight of the sleigh - to 353,430 tons. Again, for comparison - this is four times the weight of the Queen Elizabeth.

5) 353,000 tons traveling at 650 miles per second creates enormous air resistance - this will heat the reindeer up in the same fashion as spacecraft re-entering the earth's atmosphere. The lead pair of reindeer will absorb 14.3 QUINTILLION joules of energy. Per second. Each.

In short, they will burst into flame almost instantaneously, exposing the reindeer behind them, and create deafening sonic booms in their wake. The entire reindeer team will be vaporized within 4.26 thousandths of a second.

Santa, meanwhile, will be subjected to centrifugal forces 17,500.06 times greater than gravity. A 250-pound Santa (which seems ludicrously slim) would be pinned to the back of his sleigh by 4,315,015 pounds of force. In conclusion - If Santa ever DID deliver presents on Christmas Eve, he's dead now.

(NOTE: This appeared in the SPY Magazine (January, 1990) )

Of course Santa, like markets, is magic and that is not accounted for in this analysis.

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