Here is an interesting article from mortgagenews.com.  The implications of existing home sales increasing are positive to all the stakeholders - including buyers, sellers and financiers of these homes.
Existing-home sales improved in May and remain solidly above a year 
ago, while the median price continued to rise by double-digit rates from
 a year earlier, according to the National Association of Realtor.
Total existing-home sales,
 which are completed transactions that include single-family homes, 
town homes, condominiums and co-ops, rose 4.2 percent to a seasonally 
adjusted annual rate of 5.18 million in May from 4.97 million in April, 
and is 12.9 percent above the 4.59 million-unit pace in May 2012.
Lawrence Yun, 
NAR chief economist, said the recovery is strengthening and to expect 
limited housing supplies for the balance of the year in much of the 
country.  “The housing numbers are overwhelmingly positive.  However, 
the number of available homes is unlikely to grow, despite a nice gain 
in May, unless new home construction ramps up quickly by an additional 
50 percent,” he said.  “The home price growth is too fast, and only 
additional supply from new home building can moderate future price 
growth.”
Existing-home sales are at the highest level since November 2009 when
 the market jumped to 5.44 million as buyers took advantage of tax 
stimulus.  Sales have stayed above year-ago levels for 23 months, while 
the national median price shows 15 consecutive months of year-over-year 
increases.
Total housing inventory at the end of May rose 3.3 percent to 2.22 
million existing homes available for sale, which represents a 5.1-month 
supply at the current sales pace, down from 5.2 months in 
April.  Listed inventory is 10.1 percent below a year ago, when there 
was a 6.5-month supply.
The national median existing-home price for all housing 
types was $208,000 in May, up 15.4 percent from May 2012.  This marks 
six straight months of double-digit increases and is the strongest price
 gain since October 2005, which jumped a record 16.6 percent from a year
 earlier.  The last time there were 15 consecutive months of 
year-over-year price increases was from March 2005 to May 2006.
Distressed homes4 – foreclosures and short sales – 
accounted for 18 percent of May sales, unchanged from April, but 
matching the lowest share since monthly tracking began in October 2008; 
they were 25 percent in May 2012.  Fewer distressed homes, which 
generally sell at a discount, account for some of the price gain.
Eleven percent of May sales were foreclosures, and 7 percent were 
short sales.  Foreclosures sold for an average discount of 15 percent 
below market value in May, while short sales were discounted 12 percent.
According to Freddie Mac, the national average commitment rate
 for a 30-year, conventional, fixed-rate mortgage rose to 3.54 percent 
in May from 3.45 percent in April; it was 3.80 percent in May 2012.
NAR President Gary Thomas,
 broker-owner of Evergreen Realty in Villa Park, Calif., said market 
conditions today are vastly different than during the housing boom.  
“The boom period was marked by easy credit and overbuilding, but today 
we have tight mortgage credit and widespread shortages of homes for 
sale,” he said.“The issue now is pent-up demand and strong growth in the number of 
households, with buyer traffic 29 percent above a year ago, coinciding 
with several years of inadequate housing construction.  These conditions
 are contributing to sustainable price growth,” Thomas said.The median time on market for all homes was 41 days in May, down from
 46 days in April, and is 43 percent faster than the 72 days on market 
in May 2012.  Short sales were on the market for a median of 79 days, 
while foreclosures typically sold in 43 days and non-distressed homes 
took 39 days.
Forty-five percent of all homes sold in May were on the market for 
less than a month.  The median time on the market is the shortest since 
monthly tracking began in May 2011; on an annual basis, a separate NAR 
survey of home buyers and sellers shows the shortest selling time was 4 
weeks in both 2004 and 2005.
First-time buyers accounted for 28 percent of purchases in May, compared with 29 percent in April and 34 percent in May 2012.
All-cash sales were at 33 percent of transactions in May, up from 32 
percent in April and 28 percent in May 2012.  Individual investors, who 
account for many cash sales, purchased 18 percent of homes in May; they 
were 19 percent in April and 17 percent in May 2012.
Single-family home sales rose 5.0 percent to a seasonally adjusted 
annual rate of 4.60 million in May from 4.38 million in April, and are 
12.7 percent higher than the 4.08 million-unit pace in May 2012.  The 
median existing single-family home price was $208,700 in May, up 15.8 
percent above a year ago, the strongest increase since October 2005 when
 it jumped 16.9 percent from a year earlier.
Existing condominium and co-op sales slipped 1.7 percent to an 
annualized rate of 580,000 units in May from 590,000 in April, but are 
13.7 percent above the 510,000-unit level a year ago.  The median 
existing condo price was $202,100 in May, which is 11.8 percent above 
May 2012.
Regionally, existing-home sales in the Northeast rose 1.6 percent to 
an annual rate of 650,000 in May and are 8.3 percent above May 2012.  
The median price in the Northeast was $269,600, up 12.3 percent from a 
year ago.
Existing-home sales in the Midwest jumped 8.0 percent in May to a 
pace of 1.21 million, and are 16.3 percent higher than a year ago.  The 
median price in the Midwest was $159,800, up 8.2 percent from May 2012.
In the South, existing-home sales rose 4.0 percent to an annual level
 of 2.09 million in May and are 16.1 percent above May 2012.  The median
 price in the South was $183,300, which is 15.0 percent above a year 
ago.Existing-home sales in the West increased 2.5 percent to a pace of 
1.23 million in May and are 7.0 percent above a year ago.  With the 
tightest regional supply, the median price in the West was $276,400, up 
19.9 percent from May 2012.The National Association of Realtors, “The Voice for Real
 Estate,” is America’s largest trade association, representing 1 million
 members involved in all aspects of the residential and commercial real 
estate industries.  For additional commentary and consumer information.
Existing-home sales, which include single-family, 
townhomes, condominiums and co-ops, are based on transaction closings 
from Multiple Listing Services.  Changes in sales trends outside of MLSs
 are not captured in the monthly series.  NAR re benchmarks home sales 
periodically using other sources to assess overall home sales trends, 
including sales not reported by MLSs.
Existing-home sales, based on closings, differ from the U.S. Census 
Bureau’s series on new single-family home sales, which are based on 
contracts or the acceptance of a deposit.  Because of these differences,
 it is not uncommon for each series to move in different directions in 
the same month.  In addition, existing-home sales, which account for 
more than 90 percent of total home sales, are based on a much larger 
data sample – about 40 percent of multiple listing service data each 
month – and typically are not subject to large prior-month revisions.
The annual rate for a particular month represents what the total 
number of actual sales for a year would be if the relative pace for that
 month were maintained for 12 consecutive months.  Seasonally adjusted 
annual rates are used in reporting monthly data to factor out seasonal 
variations in resale activity.  For example, home sales volume is 
normally higher in the summer than in the winter, primarily because of 
differences in the weather and family buying patterns.  However, 
seasonal factors cannot compensate for abnormal weather patterns.
Single-family data collection began monthly in 1968, while condo data
 collection began quarterly in 1981; the series were combined in 1999 
when monthly collection of condo data began.  Prior to this period, 
single-family homes accounted for more than nine out of 10 purchases.  
Historic comparisons for total home sales prior to 1999 are based on 
monthly single-family sales, combined with the corresponding quarterly 
sales rate for condos.
Total inventory and month’s supply data are available 
back through 1999, while single-family inventory and month’s supply are 
available back to 1982 (prior to 1999, single-family sales accounted for
 more than 90 percent of transactions and condos were measured only on a
 quarterly basis).
The median price is where half sold for more and half 
sold for less; medians are more typical of market conditions than 
average prices, which are skewed higher by a relatively small share of 
upper-end transactions. The only valid comparisons for median prices are
 with the same period a year earlier due to a seasonality in buying 
patterns.  Month-to-month comparisons do not compensate for seasonal 
changes, especially for the timing of family buying patterns.  Changes 
in the composition of sales can distort median price data.  Year-ago 
median and mean prices sometimes are revised in an automated process if 
additional data is received.