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* Beyond timing of QE3, debate over which assets to target

* Economic benefits from MBS, but Treasury market bigger

* Debate could impact decision on asset sales in exit

By Jonathan Spicer and Ann Saphir

NEW YORK/SAN FRANCISCO, May 1 (Reuters) – Top Federal

Reserve officials are happy with the boost their asset purchases

are giving the housing market, suggesting mortgage bonds could

trump Treasuries when the U.S. central bank tinkers with its

bond-buying program.

While much of the public debate has focused on if and when

the Fed will cut back on its bond buys, more and more

policymakers are taking sides in the debate over which assets

the central bank should concentrate on.

No changes are expected when the Fed wraps up a two-day

policy meeting on Wednesday. Economists widely agree it will

continue with monthly purchases of $40 billion in

mortgage-backed securities (MBS) and $45 billion in Treasuries

in an all-out effort to spur borrowing, investing and hiring

across the United States.

But if some doves at the Fed have their way, the central

bank might trim its Treasuries purchases first if it decides to

start tapering stimulus. Similarly, the central bank could end

up holding MBS longer if and when it eventually decides it is

time to sell off some assets to shrink its balance sheet.

While some hawkish officials say improvements in housing

should lead the Fed to stand down on mortgage bonds, the dovish

officials have held sway on policy since the Great Recession.

Boston Federal Reserve Bank President Eric Rosengren is

among those who say near-record low mortgage rates and

rebounding home sales reflect the success of directing stimulus

toward housing, arguing if anything for more rather than less.

“I always take Rosengren’s views as mirroring those of the

Fed chairman … and the chairman has not made many concessions

to the hawks yet,” said Christopher Rupkey, New York-based chief

financial economist at Bank of Tokyo-Mitsubishi.

“MBS probably helps the housing market strengthen and maybe

it should be the last to be cut,” he said.

WORRIES ON MARKET FUNCTIONING

On the other side of the debate are a number of hawkish

policymakers, like Richmond Fed chief Jeffrey Lacker.

These officials object to the policy, in part, because they

do not think the Fed should aim to prop up a particular sector

of the economy. Funneling credit, they say, is the market’s job.

They also worry the Fed could become so dominant in the

agency mortgage market that investors would be scared off,

possibly raising borrowing costs and undermining the policy.

At $5.7 trillion this market of securities backed by Fannie

Mae, Freddie Mac, Ginnie Mae and the federal home loan banks is

not much more than half the size of the $10.9 trillion market

for Treasuries.

Simon Potter, who oversees trading at the central bank’s New

York headquarters, said in March that demand for MBS had not yet

overwhelmed supply. But he too warned of trouble if it ever did.

CRUX OF THE CRISIS

Arguably, purchasing MBS rather than Treasuries more

directly influences the economy through the rate Americans get

on mortgages.

Last week, the average 30-year fixed rate mortgage hit a

near record low of 3.4 percent, down from 3.55 percent when the

Fed launched its latest stimulus effort in September, according

to Freddie Mac. That cheap financing is having its effect:

housing starts breached the 1-million unit-rate mark in March

for the first time since mid-2008.

There is also a simple logic to stimulating housing. The

housing collapse hurt by destroying construction jobs and by

destroying household net worth and as a result spending.

Rekindling housing throws that negative cycle into reverse,

giving what San Francisco Fed chief John Williams has called an

“oomph” to the economy.

Housing investment was less than 3 percent of GDP in 2012,

but typically is about 5 percent, suggesting plenty of room for

growth; all housing services typically account for 18 percent of

GDP, above the 15 percent seen last year.

Williams credits Fed policies, including both MBS and

Treasury purchases, with helping to push mortgage rates down

about 1.5 percentage points since the Fed’s first mortgage-bond

purchases back in 2008, and notes that the decline has helped

boost home sales and puts money in consumers’ pockets by

trimming monthly mortgage payments.

“As far as getting the most bang for your buck going

forward,” said Andrew Szczurowski, an MBS portfolio manager at

Eaton Vance, “mortgage purchases are the more appropriate

transmission mechanism as there are still millions of borrowers

who sit in mortgages (well) above market rates.”

FED’S FRONT LINES

The central bank buys about a quarter of all coupon

Treasuries that are issued each month.

But the Fed has snapped up about half of all the newly

issued MBS since it resumed buying them in September. That

portion could rise, possibly imperiling markets, if refinancing

activity declines as the economy improves and borrowing costs

rise, dissuading people from refinancing and leaving the market

with a smaller supply of tradable securities.

To reduce that risk, the Fed focuses its buying on the most

plentiful securities, making a market malfunction an “unlikely”

prospect even if refinancing falls, New York Fed’s Potter said.

Potter oversees a group of traders and portfolio managers at

the New York Fed who are watching for signs the market is

buckling under the central bank’s demand.

They hold three meetings before 9:30 a.m. each week day,

sometimes with Fed policymakers calling in, to discuss overnight

news and the day’s buying plan before traders head back to their

computers to start bidding on bonds.

All the needed Treasuries are bought from dealers by 11 a.m.

while, in a neighboring room, the MBS are purchased over the

course of about 20 trades throughout the day.

So far “there seems to be little evidence” the buying is

sapping liquidity or straining either of the markets, Potter

told the Forecasters Club of New York in March.

Even so, a recent New York Fed poll of Wall Street banks

showed most expect the Fed to have stopped buying MBS by March

2014 even as it continues to buy some Treasuries.

The question of which of the securities are more efficacious

will also surface in the years ahead, when the central bank

might decide to shrink its balance sheet, now worth some $3.2

trillion, to a more normal size around $1 trillion.

Unlike Treasuries, MBS have monthly prepayments that could

help the Fed reach that goal sooner. That could convince

officials to buy more of them now and to not rush to sell them

off in the years ahead.

In addition, minutes of the Fed’s last meeting in March

showed several officials favored holding on to MBS, or selling

them only very slowly, to lessen any market disruption from

sales. Meaning, the Fed could be in the housing market longer

than many now anticipate.

(Additional reporting by Albert Duros; Editing by Tim Ahmann,

Mary Milliken and Leslie Gevirtz)